diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index 4086eec..a913b24 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -2010,6 +2010,30 @@ captures, style results, and the single Unreal adapter version edit.
 [`Standalone/Research/WorldAssemblerM3/Linux25/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux25/REPORT.md)
 records the evidence and caveats.
 
+### 8.44 Walkable passages as tunnels in rock — World Assembler L26
+
+L25 correctly stopped support from appearing in native air, but its SurfaceWorld-recipe passages
+still crossed a long open volume in the SurfaceWorld arrival strata. The segment map places that gap
+inside SurfaceWorld (about `-146` to `-497 m`), after the TunnelNetwork transition; it is not TunnelNetwork
+cave air. Both ends meet native rock. The shared Core planner now finds contiguous unsupported ranges
+from the native field sign and caches them by resolved-layout identity. It adds a deterministic,
+relief-bearing rock span only across those ranges. The span is at least 5 m wide, several metres thick,
+and joins native rock at both ends. The passage carve then opens the bore through the added density,
+leaving a grounded floor and rock walls/ceiling. SurfaceWorld away from the passage remains unchanged.
+
+Native route support remains gated on pre-passage solid density. Before adding any support density, the
+composer also checks the resolved player capsule, so neighboring floor segments cannot restore rock
+inside the avatar path. This keeps all four style overrides walkable in both recipes. The bridge audit
+measures its authored density field at 256 route sections, checks the 5 m width and connected ends, and
+records a relief-bearing thickness range; the open-air audit still runs the L24 negative control.
+
+The shared evaluator is version 13; FloatingIslands geometry remains version 7 and resolved-layout
+schema V3 is unchanged. These changes are in Core and the standalone audit/capture path; no Unreal
+adapter edit is required. The L26 report contains the eight-style table, hashes, captures and run history.
+
+[`Standalone/Research/WorldAssemblerM3/Linux26/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux26/REPORT.md)
+records the final evidence.
+
 ## 9. Multiplayer model (listen-server first, dedicated-friendly)
 
 > **Status: transport is DESIGN ONLY — nothing is networked in-tree yet** (no `Replicated`/`HasAuthority`/RPCs; a
diff --git a/CODEMAP.md b/CODEMAP.md
index 083dab3..092e38d 100644
--- a/CODEMAP.md
+++ b/CODEMAP.md
@@ -1194,6 +1194,20 @@ The shared evaluator is version 12 and FI geometry version is 7; resolved-layout
 unchanged. See ARCHITECTURE §8.43 and
 [`Standalone/Research/WorldAssemblerM3/Linux25/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux25/REPORT.md).
 
+### 3.27 Tunnels in native rock with grounded passage bridges — World Assembler L26
+
+| Symbol | Canonical file | Role |
+|---|---|---|
+| `BuildPassageBridgePlan` / `PassageBridgeSignedDistance` | `Standalone/Core/src/ShapeWorldInternal.h` | Uses native density sign to plan cached, connected rock spans only across unsupported route ranges; shared by both recipes and all passage styles. |
+| `PassageBridgeCache` | `Standalone/Source/OwnerWorldLoader.h` | Shares deterministic ranges by resolved-layout identity across shape instances. |
+| `ApplyResolvedStratePassageCarves` | `Standalone/Core/src/ShapeWorldInternal.h` | Adds bridge density before carving the bore; gates native floor support on solid input and player-capsule clearance. |
+| `auditPassageBridges` / `auditPassageOpenAir` / `--audit-resolved-layout-passages` | `Standalone/Source/StreamBenchmarkPipeline.h` | Measures bridge width, thickness, relief and connected ends; checks capsule support, open air, naturalness, route binding and the L24 negative control. |
+| `PassageBridgeRangeAuditV1` / `passageBridgeRanges()` / `isPassageBridgeSample()` | `Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h`, `Standalone/Core/src/VoxelForgeCore.cpp` | Exposes audit-only bridge ranges and density queries to the standalone validator. |
+
+The shared evaluator is version 13; FloatingIslands geometry remains version 7 and resolved-layout
+schema V3 is unchanged. See ARCHITECTURE §8.44 and
+[`Standalone/Research/WorldAssemblerM3/Linux26/REPORT.md`](Standalone/Research/WorldAssemblerM3/Linux26/REPORT.md).
+
 ## 4. The density pipeline (most-edited hot path)
 
 ### 4.1 `GetDensityWithParams` (TunnelNetwork) — VoxelGenerator.cpp:3749
diff --git a/Standalone/BuildLinux.sh b/Standalone/BuildLinux.sh
index 9e96f42..be69f95 100755
--- a/Standalone/BuildLinux.sh
+++ b/Standalone/BuildLinux.sh
@@ -36,8 +36,9 @@ command -v ar >/dev/null || { printf 'ar not found\n' >&2; exit 2; }
 command -v pkg-config >/dev/null || { printf 'pkg-config not found\n' >&2; exit 2; }
 pkg-config --exists egl glesv2 libpng || { printf 'EGL, GLESv2, and libpng development files are required\n' >&2; exit 2; }
 
-BUILD_DIR="$ROOT/Build/linux-$VARIANT"
-BIN_DIR="$ROOT/bin/linux"
+BUILD_ROOT="${VOXELFORGE_BUILD_ROOT:-$ROOT/Build}"
+BIN_DIR="${VOXELFORGE_BIN_DIR:-$ROOT/bin/linux}"
+BUILD_DIR="$BUILD_ROOT/linux-$VARIANT"
 mkdir -p "$BUILD_DIR/wrappers" "$BUILD_DIR/objects" "$BIN_DIR"
 
 INCLUDES=(
diff --git a/Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h b/Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h
index a700e8f..c36434b 100644
--- a/Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h
+++ b/Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h
@@ -249,8 +249,8 @@ namespace VoxelForgeCore
     // L'assembleur v1 encode coordonnees et scalaires en 1/256 de voxel, independamment des tuiles.
     inline constexpr std::int64_t WorldAssemblySubvoxelsPerVoxel = 256;
     inline constexpr std::uint32_t WorldAssemblySchemaVersion = 2;
-    // Version 12 gates passage supports on native rock and anchors the FI spiral inside a measured root.
-    inline constexpr std::uint32_t WorldAssemblyEvaluatorVersion = 12;
+    // Version 13 adds connected relief-bearing rock spans across native open-air passage gaps.
+    inline constexpr std::uint32_t WorldAssemblyEvaluatorVersion = 13;
 
     enum class FieldChannel : std::uint32_t
     {
@@ -666,6 +666,17 @@ namespace VoxelForgeCore
         std::vector<ResolvedLayoutPassagePointV1> controlPoints;
     };
 
+    struct PassageBridgeRangeAuditV1
+    {
+        std::size_t passageIndex = 0;
+        std::size_t firstSegment = 0;
+        std::size_t lastSegment = 0;
+        std::uint64_t unsupportedSamples = 0;
+        double unsupportedLengthMetres = 0.0;
+        std::array<double, 4> startPointSubvoxels{};
+        std::array<double, 4> endPointSubvoxels{};
+    };
+
     struct ResolvedLayoutPassageConfigV1
     {
         std::int32_t upperStrateIndex = -1;
@@ -1314,6 +1325,10 @@ namespace VoxelForgeCore
         ShapeBuildStats buildStats() const;
 
         float densityAt(Vec3d voxelPosition) const;
+        // Audit-only view of connected rock spans planned for passage support.
+        std::vector<PassageBridgeRangeAuditV1> passageBridgeRanges() const;
+        bool isPassageBridgeSample(std::size_t passageIndex, std::size_t segmentIndex,
+                                   Vec3d voxelPosition) const;
         // Audit-only selector provenance for the same point evaluator; never used by meshing.
         std::string densityDispatchPathAt(Vec3d voxelPosition) const;
         // Analytic source distance without the occupancy-preserving near-zero clamp or packed proxy.
diff --git a/Standalone/Core/src/ShapeWorldInternal.h b/Standalone/Core/src/ShapeWorldInternal.h
index aa0020b..75c07b7 100644
--- a/Standalone/Core/src/ShapeWorldInternal.h
+++ b/Standalone/Core/src/ShapeWorldInternal.h
@@ -41,6 +41,27 @@ public:
         double SealThickness=0.0;
     };
 
+    const std::vector<FStandalonePassageBridgeRange>& GetPassageBridgeRanges() const
+    {return PassageBridgeRanges;}
+
+    bool IsResolvedPassageBridgeSample(std::size_t PassageIndex,std::size_t SegmentIndex,
+        const VoxelForgeCore::Vec3d& Position) const
+    {
+        if(IsPassageBridgeSegment(PassageIndex,SegmentIndex)
+            &&PassageBridgeSignedDistance(PassageIndex,SegmentIndex,
+                static_cast<float>(Position.x),static_cast<float>(Position.y),
+                static_cast<float>(Position.z))<=0.0)return true;
+        for(const auto& range:PassageBridgeRanges)
+        {
+            if(range.passageIndex!=PassageIndex)continue;
+            for(std::size_t segment=range.firstSegment;segment<=range.lastSegment;++segment)
+                if(segment!=SegmentIndex&&PassageBridgeSignedDistance(PassageIndex,segment,
+                    static_cast<float>(Position.x),static_cast<float>(Position.y),
+                    static_cast<float>(Position.z))<=0.0)return true;
+        }
+        return false;
+    }
+
     double GetCoreVoxelSizeCm() const
     {
         return Owner == nullptr || Owner->CoreVoxelSizeMicrons == 0
@@ -168,20 +189,19 @@ public:
         for(const auto& passage:ResolvedLayout->passages)
             composeRouteMouthSupport(passage.upperStrateIndex,
                 passage.upperMouthSubvoxels,true);
-        for(const auto& passage:ResolvedLayout->passages)
+        for(std::size_t passageIndex=0;passageIndex<ResolvedLayout->passages.size();++passageIndex)
         {
+            const auto& passage=ResolvedLayout->passages[passageIndex];
             if(passage.controlPoints.size()<2)continue;
-            const double placementRadiusQ=static_cast<double>(passage.placementRadiusSubvoxels)
-                +static_cast<double>(passage.midRadiusSubvoxels);
-            if(qx*qx+qy*qy>placementRadiusQ*placementRadiusQ)
-                continue;
             const double firstFloorQ=passage.controlPoints.front().positionSubvoxels[2]
                 -passage.controlPoints.front().radiusSubvoxels+playerCenterAboveFloorQ;
             const double lastFloorQ=passage.controlPoints.back().positionSubvoxels[2]
                 -passage.controlPoints.back().radiusSubvoxels+playerCenterAboveFloorQ;
             if(qz>firstFloorQ+2.0*passage.mouthRadiusSubvoxels
                 ||qz<lastFloorQ-2.0*passage.mouthRadiusSubvoxels)
+            {
                 continue;
+            }
             const auto floorProfile=[&](const auto& point)
             {return point.positionSubvoxels[2]-point.radiusSubvoxels+playerCenterAboveFloorQ;};
             const std::ptrdiff_t lastIndex=static_cast<std::ptrdiff_t>(passage.controlPoints.size())-1;
@@ -204,8 +224,10 @@ public:
             const std::ptrdiff_t carveEnd=std::min<std::ptrdiff_t>(lowerMouthIndex-1,
                 (carveLow-passage.controlPoints.begin())+1);
             double bestSignedDistance=std::numeric_limits<double>::infinity();
+            double bestPlayerCapsuleSignedDistance=std::numeric_limits<double>::infinity();
             double bestT=0.0;
             std::ptrdiff_t bestIndex=0;
+            std::ptrdiff_t bestSupportSegmentIndex=0;
             bool hasSupportFloor=false;
             double bestSupportDensity=0.0;
             const auto considerCarveSegment=[&](std::ptrdiff_t index)
@@ -225,12 +247,37 @@ public:
                 const double ex=qx-cx,ey=qy-cy,ez=qz-cz;
                 const double radius=static_cast<double>(a.radiusSubvoxels)
                     +t*(b.radiusSubvoxels-a.radiusSubvoxels);
+                const double horizontalLengthSq=dx*dx+dy*dy;
+                const double playerT=horizontalLengthSq>0.0
+                    ?std::clamp(((qx-ax)*dx+(qy-ay)*dy)/horizontalLengthSq,0.0,1.0):t;
+                const double playerDx=qx-(ax+playerT*dx);
+                const double playerDy=qy-(ay+playerT*dy);
+                const double playerRadius=static_cast<double>(a.radiusSubvoxels)
+                    +playerT*(b.radiusSubvoxels-a.radiusSubvoxels);
+                const double playerCenterZ=az+playerT*dz-playerRadius+playerCenterAboveFloorQ;
+                const double playerVertical=std::max(0.0,
+                    std::abs(qz-playerCenterZ)-0.54*qPerMetre);
+                const double playerCapsuleDistance=DeterministicSqrt(
+                    playerDx*playerDx+playerDy*playerDy+playerVertical*playerVertical)
+                    -0.34*qPerMetre;
+                bestPlayerCapsuleSignedDistance=std::min(bestPlayerCapsuleSignedDistance,
+                    playerCapsuleDistance);
                 const double signedDistance=DeterministicSqrt(ex*ex+ey*ey+ez*ez)-radius;
                 if(signedDistance<bestSignedDistance)
                 {bestSignedDistance=signedDistance;bestT=t;bestIndex=index;}
             };
             for(std::ptrdiff_t index=carveBegin;index<=carveEnd;++index)
                 considerCarveSegment(index);
+            // Alternate styles can bend locally at either mouth, so floorProfile is
+            // not monotone over those short endpoint runs. Keep the binary search for
+            // the long descent and inspect both endpoint neighborhoods directly.
+            for(std::ptrdiff_t index=0;index<std::min<std::ptrdiff_t>(8,lowerMouthIndex);++index)
+                considerCarveSegment(index);
+            const std::ptrdiff_t mouthSearchBegin=std::max<std::ptrdiff_t>(0,lowerMouthIndex-8);
+            const std::ptrdiff_t mouthSearchEnd=std::min<std::ptrdiff_t>(lastIndex,
+                lowerMouthIndex+8);
+            for(std::ptrdiff_t index=mouthSearchBegin;index<mouthSearchEnd;++index)
+                considerCarveSegment(index);
             // The route-bound landing can rise and fall after the lower mouth. Scan
             // that short tail directly; binary search is only valid on the descent.
             for(std::ptrdiff_t index=lowerMouthIndex;index<lastIndex;++index)
@@ -250,6 +297,12 @@ public:
             const double wallReliefWeight=1.0-0.80*verticalWallAlignment;
             const double roughSignedDistance=bestSignedDistance
                 +static_cast<double>(std::clamp(relief,-1.0f,1.0f))*0.24*qPerMetre*wallReliefWeight;
+            if(IsPassageBridgeSegment(passageIndex,static_cast<std::size_t>(bestIndex)))
+            {
+                const double bridgeDistance=PassageBridgeSignedDistance(passageIndex,
+                    static_cast<std::size_t>(bestIndex),X,Y,Z);
+                composed=std::min(composed,static_cast<float>(bridgeDistance/Q));
+            }
             // Positive density is air; rough rock is cut with full side/ceiling detail and
             // gentler relief on the gravity-facing wall so the supported tread stays open.
             composed=std::max(composed,static_cast<float>(-roughSignedDistance/Q));
@@ -264,7 +317,10 @@ public:
                 const double radiusB=segmentB.radiusSubvoxels;
                 // Keep the tread within the probe band and below the capsule's
                 // lowest sampled point.
-                const double floorOffset=0.20;
+                const double floorOffset=IsPassageBridgeSegment(passageIndex,
+                    static_cast<std::size_t>(index))
+                    ?PassageBridgeDeckOffsetMetres(passageIndex,static_cast<std::size_t>(index))
+                    :0.20;
                 const double horizontalLengthSq=dx*dx+dy*dy;
                 const double supportT=horizontalLengthSq>0.0
                     ?std::clamp(((qx-segmentA.positionSubvoxels[0])*dx
@@ -304,6 +360,7 @@ public:
                 if(supportDistanceSq>=bestSupportDistanceSquared)return;
                 bestSupportDistanceSquared=supportDistanceSq;
                 hasSupportFloor=true;
+                bestSupportSegmentIndex=index;
                 bestSupportDensity=std::clamp(Z-floorVoxels,
                     -supportThicknessVoxels,0.0);
             };
@@ -330,7 +387,11 @@ public:
                 considerSupportSegment(index);
             // Keep route treads inside the native rock envelope. Carving may reopen the
             // floor above this point, but a support cannot create a new surface in air.
-            if(hasSupportFloor&&density<0.0f)
+            const bool bridgeFloorSupport=hasSupportFloor
+                &&IsPassageBridgeSegment(passageIndex,
+                    static_cast<std::size_t>(bestSupportSegmentIndex));
+            if(hasSupportFloor&&bestPlayerCapsuleSignedDistance>=0.05*qPerMetre
+                &&(density<0.0f||bridgeFloorSupport))
                 composed=std::min(composed,static_cast<float>(bestSupportDensity));
         }
         return composed;
@@ -343,6 +404,10 @@ public:
     {
         if(!ResolvedLayout||ResolvedLayout->passages.empty())return false;
         constexpr double Q=static_cast<double>(VoxelForgeCore::WorldAssemblySubvoxelsPerVoxel);
+        const double voxelsPerMetre=Owner&&Owner->CoreVoxelSizeMicrons>0
+            ?1000000.0/Owner->CoreVoxelSizeMicrons:4.0;
+        const double bridgeHalfWidthVoxels=3.5*voxelsPerMetre;
+        const double bridgeFootDepthVoxels=(5.0-0.13)*voxelsPerMetre;
         for(const auto& passage:ResolvedLayout->passages)
         {
             for(std::size_t i=1;i<passage.controlPoints.size();++i)
@@ -351,13 +416,18 @@ public:
                 const double radius=static_cast<double>(std::max(a.radiusSubvoxels,b.radiusSubvoxels))/Q;
                 const double floorThicknessVoxels=Owner&&Owner->CoreVoxelSizeMicrons>0
                     ?1000000.0/Owner->CoreVoxelSizeMicrons:4.0;
+                // A resolved passage bridge extends to a 3.5 m half-width and almost 5 m
+                // below the bore floor. Keep those cells shape-dependent for classification
+                // and streaming even before its bridge ranges have been compiled.
+                const double horizontalExtent=std::max(radius,bridgeHalfWidthVoxels);
+                const double footDepth=std::max(floorThicknessVoxels,bridgeFootDepthVoxels);
                 const double low[3]={
-                    std::min(a.positionSubvoxels[0],b.positionSubvoxels[0])/Q-radius,
-                    std::min(a.positionSubvoxels[1],b.positionSubvoxels[1])/Q-radius,
-                    std::min(a.positionSubvoxels[2],b.positionSubvoxels[2])/Q-radius-floorThicknessVoxels};
+                    std::min(a.positionSubvoxels[0],b.positionSubvoxels[0])/Q-horizontalExtent,
+                    std::min(a.positionSubvoxels[1],b.positionSubvoxels[1])/Q-horizontalExtent,
+                    std::min(a.positionSubvoxels[2],b.positionSubvoxels[2])/Q-radius-footDepth};
                 const double high[3]={
-                    std::max(a.positionSubvoxels[0],b.positionSubvoxels[0])/Q+radius,
-                    std::max(a.positionSubvoxels[1],b.positionSubvoxels[1])/Q+radius,
+                    std::max(a.positionSubvoxels[0],b.positionSubvoxels[0])/Q+horizontalExtent,
+                    std::max(a.positionSubvoxels[1],b.positionSubvoxels[1])/Q+horizontalExtent,
                     std::max(a.positionSubvoxels[2],b.positionSubvoxels[2])/Q+radius};
                 bool overlap=true;
                 for(int axis=0;axis<3;++axis)
@@ -715,6 +785,7 @@ public:
         if(RoundTunnelsEnabled)
             BuildRoundTunnelPrimitives();
         BuildSpatialBins(LineBinSize);
+        BuildPassageBridgePlan();
         Stats.LocalLineBinSeconds=std::chrono::duration<double>(Clock::now()-Substage).count();
         Stats.ShapeSeconds=std::chrono::duration<double>(Clock::now()-Stage).count();
         Stats.PrimitiveCount=Primitives.size();
@@ -1622,6 +1693,218 @@ public:
     }
 
 private:
+    bool IsPassageBridgeSegment(std::size_t PassageIndex,std::size_t SegmentIndex) const
+    {
+        return std::any_of(PassageBridgeRanges.begin(),PassageBridgeRanges.end(),
+            [PassageIndex,SegmentIndex](const auto& range)
+                {return range.passageIndex==PassageIndex
+                    &&SegmentIndex>=range.firstSegment&&SegmentIndex<=range.lastSegment;});
+    }
+
+    double PassageBridgeDeckOffsetMetres(std::size_t PassageIndex,
+        std::size_t SegmentIndex) const
+    {
+        for(const auto& range:PassageBridgeRanges)
+        {
+            if(range.passageIndex!=PassageIndex||SegmentIndex>range.lastSegment)continue;
+            if(SegmentIndex>=range.firstSegment)return 0.13;
+        }
+        return 0.20;
+    }
+
+    double PassageBridgeSignedDistance(std::size_t PassageIndex,std::size_t SegmentIndex,
+        float X,float Y,float Z) const
+    {
+        if(!ResolvedLayout||PassageIndex>=ResolvedLayout->passages.size())
+            return std::numeric_limits<double>::infinity();
+        const auto& passage=ResolvedLayout->passages[PassageIndex];
+        if(SegmentIndex+1>=passage.controlPoints.size())
+            return std::numeric_limits<double>::infinity();
+        constexpr double Q=static_cast<double>(VoxelForgeCore::WorldAssemblySubvoxelsPerVoxel);
+        const double qPerMetre=Q*1000000.0/std::max<std::uint32_t>(1,
+            ResolvedLayout->coreVoxelSizeMicrometres);
+        const auto& a=passage.controlPoints[SegmentIndex];
+        const auto& b=passage.controlPoints[SegmentIndex+1];
+        const double ax=static_cast<double>(a.positionSubvoxels[0]);
+        const double ay=static_cast<double>(a.positionSubvoxels[1]);
+        const double dx=static_cast<double>(b.positionSubvoxels[0])-ax;
+        const double dy=static_cast<double>(b.positionSubvoxels[1])-ay;
+        const double horizontalLengthSq=dx*dx+dy*dy;
+        const double qx=static_cast<double>(X)*Q,qy=static_cast<double>(Y)*Q;
+        const double qz=static_cast<double>(Z)*Q;
+        const double t=horizontalLengthSq>0.0
+            ?std::clamp(((qx-ax)*dx+(qy-ay)*dy)/horizontalLengthSq,0.0,1.0):0.0;
+        const double centerX=ax+t*dx,centerY=ay+t*dy;
+        const double centerZ=a.positionSubvoxels[2]+t*(
+            static_cast<double>(b.positionSubvoxels[2])-a.positionSubvoxels[2]);
+        const double radius=a.radiusSubvoxels+t*(
+            static_cast<double>(b.radiusSubvoxels)-a.radiusSubvoxels);
+        // Embed the deck 13 cm above the bore bottom: within the 25 cm support
+        // probe, while leaving 16 cm between it and the capsule's lowest sample.
+        const double floorQ=centerZ-radius
+            +PassageBridgeDeckOffsetMetres(PassageIndex,SegmentIndex)*qPerMetre;
+        const double relief=std::clamp(static_cast<double>(VF_FieldSurfaceRelief(X,Y,Z,
+            static_cast<std::uint32_t>(Owner?Owner->Seed:0))),-1.0,1.0);
+        const double halfWidth=(3.30+0.20*relief)*qPerMetre;
+        const double thickness=(4.0+1.0*relief)*qPerMetre;
+        const double horizontalDistance=DeterministicSqrt((qx-centerX)*(qx-centerX)
+            +(qy-centerY)*(qy-centerY));
+        const double sideDistance=horizontalDistance-halfWidth;
+        const double topDistance=qz-floorQ;
+        const double bottomDistance=floorQ-thickness-qz;
+        const double verticalDistance=std::max(topDistance,bottomDistance);
+        const double outside=DeterministicSqrt(
+            std::max(sideDistance,0.0)*std::max(sideDistance,0.0)
+            +std::max(verticalDistance,0.0)*std::max(verticalDistance,0.0));
+        const double inside=std::min(std::max(sideDistance,verticalDistance),0.0);
+        return outside+inside;
+    }
+
+    float NativePassageDensityAt(float X,float Y,float Z) const
+    {
+        float density=0.0f;
+        if(!NativeFloatingIslandDensityAt(X,Y,Z,density)
+            &&!NativeSurfaceDensityAt(X,Y,Z,density))
+        {
+            if(UsesLegacySurfaceField(X,Y,Z)&&Owner&&Owner->Generator)
+                density=Owner->Generator->GetDensityAt(X,Y,Z);
+            else
+                density=AnalyticDensityAt(X,Y,Z,true,nullptr,nullptr,nullptr,
+                    false,false);
+        }
+        return ApplyResolvedStrateBoundaryBand(density,X,Y,Z);
+    }
+
+    void BuildPassageBridgePlan()
+    {
+        PassageBridgeRanges.clear();
+        if(!Owner||!ResolvedLayout||ResolvedLayout->passages.empty()
+            ||!Owner->PassageBridgeCache)return;
+        auto& cache=*Owner->PassageBridgeCache;
+        std::lock_guard<std::mutex> lock(cache.mutex);
+        const auto cached=cache.byLayout.find(ResolvedLayout->stableIdentity);
+        if(cached!=cache.byLayout.end())
+        {PassageBridgeRanges=cached->second;return;}
+
+        constexpr double Q=static_cast<double>(VoxelForgeCore::WorldAssemblySubvoxelsPerVoxel);
+        const double qPerMetre=Q*1000000.0/std::max<std::uint32_t>(1,
+            ResolvedLayout->coreVoxelSizeMicrometres);
+        const auto inSurfaceWorldStratum=[&](double zSubvoxels)
+        {
+            const double zMicrometres=zSubvoxels
+                *ResolvedLayout->coreVoxelSizeMicrometres/Q;
+            return std::any_of(ResolvedLayout->strates.begin(),ResolvedLayout->strates.end(),
+                [zMicrometres](const auto& stratum)
+                {return stratum.generatorKind=="SurfaceWorld"
+                    &&zMicrometres>=stratum.interiorBottomMicrometres
+                    &&zMicrometres<stratum.interiorTopMicrometres;});
+        };
+        constexpr std::array<std::array<double,2>,5> supportOffsets{{
+            {{0.0,0.0}},{{0.45,0.0}},{{-0.45,0.0}},{{0.0,0.45}},{{0.0,-0.45}}}};
+        constexpr std::array<double,2> supportDepthsMetres{{0.125,0.25}};
+        struct FPathSample
+        {
+            std::size_t segment=0;
+            std::array<double,4> point{};
+            bool nativeSupported=false;
+        };
+        const auto nativeSupportedAt=[&](const std::array<double,4>& point)
+        {
+            const double floorQ=point[2]-point[3]+0.13*qPerMetre;
+            std::uint32_t supported=0;
+            for(const auto& offset:supportOffsets)
+            {
+                bool hasSolid=false;
+                for(const double depth:supportDepthsMetres)
+                {
+                    const double sampleZ=floorQ-depth*qPerMetre;
+                    // Bridge spans address the measured SurfaceWorld void. Other native
+                    // strata retain their own route/cave composition and are excluded here.
+                    if(!inSurfaceWorldStratum(sampleZ)){hasSolid=true;break;}
+                    float density=1.0f;
+                    if(!NativeSurfaceDensityAt(
+                        static_cast<float>((point[0]+offset[0]*qPerMetre)/Q),
+                        static_cast<float>((point[1]+offset[1]*qPerMetre)/Q),
+                        static_cast<float>(sampleZ/Q),density))continue;
+                    if(density<0.0f){hasSolid=true;break;}
+                }
+                supported+=hasSolid;
+            }
+            return supported>=3;
+        };
+        for(std::size_t passageIndex=0;passageIndex<ResolvedLayout->passages.size();
+            ++passageIndex)
+        {
+            const auto& passage=ResolvedLayout->passages[passageIndex];
+            if(passage.controlPoints.size()<2)continue;
+            std::vector<FPathSample> samples;
+            samples.reserve(passage.controlPoints.size()*2);
+            const auto pointAt=[&](std::size_t segment,double t)
+            {
+                const auto& a=passage.controlPoints[segment];
+                const auto& b=passage.controlPoints[segment+1];
+                FPathSample sample;sample.segment=segment;
+                for(std::size_t axis=0;axis<3;++axis)
+                    sample.point[axis]=a.positionSubvoxels[axis]+t*(
+                        static_cast<double>(b.positionSubvoxels[axis])
+                            -a.positionSubvoxels[axis]);
+                sample.point[3]=a.radiusSubvoxels+t*(
+                    static_cast<double>(b.radiusSubvoxels)-a.radiusSubvoxels);
+                sample.nativeSupported=nativeSupportedAt(sample.point);
+                return sample;
+            };
+            samples.push_back(pointAt(0,0.0));
+            for(std::size_t segment=0;segment+1<passage.controlPoints.size();++segment)
+            {
+                const auto& a=passage.controlPoints[segment];
+                const auto& b=passage.controlPoints[segment+1];
+                const double dx=static_cast<double>(b.positionSubvoxels[0])-a.positionSubvoxels[0];
+                const double dy=static_cast<double>(b.positionSubvoxels[1])-a.positionSubvoxels[1];
+                const double dz=static_cast<double>(b.positionSubvoxels[2])-a.positionSubvoxels[2];
+                const double lengthMetres=DeterministicSqrt(dx*dx+dy*dy+dz*dz)/qPerMetre;
+                const std::size_t intervals=std::max<std::size_t>(1,
+                    static_cast<std::size_t>(std::ceil(lengthMetres/0.5)));
+                for(std::size_t step=1;step<=intervals;++step)
+                    samples.push_back(pointAt(segment,static_cast<double>(step)/intervals));
+            }
+            std::size_t cursor=0;
+            while(cursor<samples.size())
+            {
+                if(samples[cursor].nativeSupported){++cursor;continue;}
+                const std::size_t gapBegin=cursor;
+                while(cursor<samples.size()&&!samples[cursor].nativeSupported)++cursor;
+                const std::size_t gapEnd=cursor-1;
+                if(gapBegin==0||cursor>=samples.size())continue;
+                double gapLength=0.0;
+                for(std::size_t index=gapBegin;index<=gapEnd;++index)
+                {
+                    const auto& a=samples[index-1].point;
+                    const auto& b=samples[index].point;
+                    const double dx=b[0]-a[0],dy=b[1]-a[1],dz=b[2]-a[2];
+                    gapLength+=DeterministicSqrt(dx*dx+dy*dy+dz*dz)/qPerMetre;
+                }
+                if(gapLength<1.0)continue;
+                FStandalonePassageBridgeRange range;
+                range.passageIndex=passageIndex;
+                range.firstSegment=samples[gapBegin-1].segment;
+                range.lastSegment=samples[cursor].segment;
+                range.unsupportedSamples=gapEnd-gapBegin+1;
+                range.unsupportedLengthMetres=gapLength;
+                range.startPoint=samples[gapBegin-1].point;
+                range.endPoint=samples[cursor].point;
+                PassageBridgeRanges.push_back(range);
+                std::printf("[PassageRockBridgePlan] id=%s first_segment=%zu last_segment=%zu unsupported_samples=%llu gap_length_m=%.3f connected_start=1 connected_end=1 width_m=6.000 thickness_m=3.000..5.000 status=PLANNED\n",
+                    passage.stableId.c_str(),range.firstSegment,range.lastSegment,
+                    static_cast<unsigned long long>(range.unsupportedSamples),gapLength);
+            }
+            if(std::none_of(PassageBridgeRanges.begin(),PassageBridgeRanges.end(),
+                [passageIndex](const auto& range){return range.passageIndex==passageIndex;}))
+                std::printf("[PassageRockBridgePlan] id=%s spans=0 status=NOT_REQUIRED\n",
+                    passage.stableId.c_str());
+        }
+        cache.byLayout.emplace(ResolvedLayout->stableIdentity,PassageBridgeRanges);
+    }
+
     static uint64 PackLatticeKey(int32 X,int32 Y,int32 Z)
     {
         constexpr uint64 Mask=0x1FFFFFull;
@@ -1656,17 +1939,19 @@ private:
                             float* OutDetailDisplacement=nullptr,
                             float* OutCaveInfluence=nullptr,
                             float* OutFloorInfluence=nullptr,
-                            bool bApplyEdits=true) const
+                            bool bApplyEdits=true,bool bApplyComposition=true) const
     {
         if(SharedDensitySource)return SharedDensitySource->AnalyticDensityAt(X,Y,Z,
-            bClampNearZero,OutDetailDisplacement,OutCaveInfluence,OutFloorInfluence,bApplyEdits);
+            bClampNearZero,OutDetailDisplacement,OutCaveInfluence,OutFloorInfluence,
+            bApplyEdits,bApplyComposition);
         if(OutDetailDisplacement)*OutDetailDisplacement=0.0f;
         if(OutCaveInfluence)*OutCaveInfluence=0.0f;
         if(OutFloorInfluence)*OutFloorInfluence=0.0f;
         float IslandDensity=0.0f;
         if(NativeFloatingIslandDensityAt(X,Y,Z,IslandDensity))
         {
-            const float composed=ApplyResolvedStrateComposition(IslandDensity,X,Y,Z);
+            const float composed=bApplyComposition
+                ?ApplyResolvedStrateComposition(IslandDensity,X,Y,Z):IslandDensity;
             return bApplyEdits?ApplyEditBrushes(composed,X,Y,Z):composed;
         }
         if(UsesLegacySurfaceField(X,Y,Z))
@@ -1674,11 +1959,13 @@ private:
             float NativeDensity=0.0f;
             if(NativeSurfaceDensityAt(X,Y,Z,NativeDensity))
             {
-                NativeDensity=ApplyResolvedStrateComposition(NativeDensity,X,Y,Z);
+                if(bApplyComposition)
+                    NativeDensity=ApplyResolvedStrateComposition(NativeDensity,X,Y,Z);
                 return bApplyEdits?ApplyEditBrushes(NativeDensity,X,Y,Z):NativeDensity;
             }
             const float Density=Owner->Generator->GetDensityAt(X,Y,Z);
-            const float composed=ApplyResolvedStrateComposition(Density,X,Y,Z);
+            const float composed=bApplyComposition
+                ?ApplyResolvedStrateComposition(Density,X,Y,Z):Density;
             return bApplyEdits?ApplyEditBrushes(composed,X,Y,Z):composed;
         }
         const bool bInsideFine=X>=Min[0]&&X<=Max[0]&&Y>=Min[1]&&Y<=Max[1]
@@ -1693,7 +1980,8 @@ private:
             if((Density<0.0f)!=bRock||(bClampNearZero&&std::abs(Density)<0.05f))
                 Density=(bRock?-1.0f:1.0f)*std::max(std::abs(Density),
                     bClampNearZero?0.05f:1.0e-7f);
-            const float composed=ApplyResolvedStrateComposition(Density,X,Y,Z);
+            const float composed=bApplyComposition
+                ?ApplyResolvedStrateComposition(Density,X,Y,Z):Density;
             return bApplyEdits?ApplyEditBrushes(composed,X,Y,Z):composed;
         }
         ESurfaceFamily SurfaceFamily=ESurfaceFamily::Strata;float SurfaceSDF=100000.0f;
@@ -1723,7 +2011,7 @@ private:
         if((Density<0.0f)!=bRock||(bClampNearZero&&std::abs(Density)<0.05f))
             Density=(bRock?-1.0f:1.0f)*std::max(std::abs(Density),
                 bClampNearZero?0.05f:1.0e-7f);
-        Density=ApplyResolvedStrateComposition(Density,X,Y,Z);
+        if(bApplyComposition)Density=ApplyResolvedStrateComposition(Density,X,Y,Z);
         return bApplyEdits?ApplyEditBrushes(Density,X,Y,Z):Density;
     }
 
@@ -5863,6 +6151,7 @@ private:
     std::vector<FFarConnectorSegment> FarConnectorSegments;
     std::unordered_map<FBinKey,std::vector<uint32>,FBinHash> FarConnectorSpatialBins;
     std::vector<FEditBrush> EditBrushes;
+    std::vector<FStandalonePassageBridgeRange> PassageBridgeRanges;
     std::array<FAxisBins,3> AxisBins;
     std::unordered_map<FBinKey,FBinItems,FBinHash> SpatialBins;
     std::unordered_map<FBinKey,FBinItems,FBinHash> CriticalAirBins;
diff --git a/Standalone/Core/src/VoxelForgeCore.cpp b/Standalone/Core/src/VoxelForgeCore.cpp
index c6e8c89..156c0d3 100644
--- a/Standalone/Core/src/VoxelForgeCore.cpp
+++ b/Standalone/Core/src/VoxelForgeCore.cpp
@@ -1164,6 +1164,44 @@ namespace VoxelForgeCore
             }
             return false;
         }
+
+        bool ResolvedPassageTouchesBox(const ResolvedLayoutSnapshotV3& layout,
+            const FIntVector& minimum,const FIntVector& maximum,std::uint32_t coreVoxelSizeMicrons)
+        {
+            if(layout.passages.empty())return false;
+            constexpr double Q=static_cast<double>(WorldAssemblySubvoxelsPerVoxel);
+            const double voxelsPerMetre=coreVoxelSizeMicrons>0
+                ?1000000.0/coreVoxelSizeMicrons:4.0;
+            const double bridgeHalfWidthVoxels=3.5*voxelsPerMetre;
+            const double bridgeFootDepthVoxels=(5.0-0.13)*voxelsPerMetre;
+            const double tileMinimum[3]={static_cast<double>(minimum.X),
+                static_cast<double>(minimum.Y),static_cast<double>(minimum.Z)};
+            const double tileMaximum[3]={static_cast<double>(maximum.X),
+                static_cast<double>(maximum.Y),static_cast<double>(maximum.Z)};
+            for(const auto& passage:layout.passages)
+            for(std::size_t segment=1;segment<passage.controlPoints.size();++segment)
+            {
+                const auto& a=passage.controlPoints[segment-1];
+                const auto& b=passage.controlPoints[segment];
+                const double radius=static_cast<double>(std::max(
+                    a.radiusSubvoxels,b.radiusSubvoxels))/Q;
+                const double horizontalExtent=std::max(radius,bridgeHalfWidthVoxels);
+                const double low[3]={
+                    std::min(a.positionSubvoxels[0],b.positionSubvoxels[0])/Q-horizontalExtent,
+                    std::min(a.positionSubvoxels[1],b.positionSubvoxels[1])/Q-horizontalExtent,
+                    std::min(a.positionSubvoxels[2],b.positionSubvoxels[2])/Q-radius
+                        -bridgeFootDepthVoxels};
+                const double high[3]={
+                    std::max(a.positionSubvoxels[0],b.positionSubvoxels[0])/Q+horizontalExtent,
+                    std::max(a.positionSubvoxels[1],b.positionSubvoxels[1])/Q+horizontalExtent,
+                    std::max(a.positionSubvoxels[2],b.positionSubvoxels[2])/Q+radius};
+                bool overlap=true;
+                for(int axis=0;axis<3;++axis)
+                    overlap&=high[axis]>=tileMinimum[axis]&&low[axis]<=tileMaximum[axis];
+                if(overlap)return true;
+            }
+            return false;
+        }
     }
 
     bool World::compile(const ShapeBuildRequest& request,const JobScheduler& scheduler,std::string& error)
@@ -1246,6 +1284,8 @@ namespace VoxelForgeCore
             if(IntersectsBox(feature.minimumSubvoxels,feature.maximumSubvoxels,
                 subMinimum,subMaximum))return false;
         if(RouteTouchesBox(*selectedPlan,subMinimum,subMaximum))return false;
+        if(ResolvedPassageTouchesBox(*impl_->resolvedLayout,boundsMin,boundsMax,
+            impl_->owner->CoreVoxelSizeMicrons))return false;
         if(OwnerPassageTouchesBox(*impl_->owner,boundsMin,boundsMax))return false;
         FStandaloneShapeWorld proofGeometry;
         if(!proofGeometry.BuildShapeDependencyProof(*impl_->owner,boundsMin,boundsMax,
@@ -1502,6 +1542,28 @@ namespace VoxelForgeCore
 
     float World::densityAt(Vec3d position) const
     { return impl_&&impl_->shapeReady.load(std::memory_order_acquire)&&impl_->shape?impl_->shape->DensityAt(static_cast<float>(position.x),static_cast<float>(position.y),static_cast<float>(position.z)):0.0f; }
+    std::vector<PassageBridgeRangeAuditV1> World::passageBridgeRanges() const
+    {
+        std::vector<PassageBridgeRangeAuditV1> result;
+        if(!impl_||!impl_->shapeReady.load(std::memory_order_acquire)||!impl_->shape)return result;
+        const auto& ranges=impl_->shape->GetPassageBridgeRanges();
+        result.reserve(ranges.size());
+        for(const auto& range:ranges)
+        {
+            PassageBridgeRangeAuditV1 value;
+            value.passageIndex=range.passageIndex;value.firstSegment=range.firstSegment;
+            value.lastSegment=range.lastSegment;value.unsupportedSamples=range.unsupportedSamples;
+            value.unsupportedLengthMetres=range.unsupportedLengthMetres;
+            value.startPointSubvoxels=range.startPoint;value.endPointSubvoxels=range.endPoint;
+            result.push_back(value);
+        }
+        return result;
+    }
+    bool World::isPassageBridgeSample(std::size_t passageIndex,std::size_t segmentIndex,
+        Vec3d position) const
+    {return impl_&&impl_->shapeReady.load(std::memory_order_acquire)&&impl_->shape
+        &&impl_->shape->IsResolvedPassageBridgeSample(passageIndex,segmentIndex,
+            {position.x,position.y,position.z});}
     std::string World::densityDispatchPathAt(Vec3d position) const
     { return impl_&&impl_->shapeReady.load(std::memory_order_acquire)&&impl_->shape
         ?impl_->shape->DensityDispatchPathAt(static_cast<float>(position.x),static_cast<float>(position.y),static_cast<float>(position.z))
diff --git a/Standalone/Research/WorldAssemblerM3/Linux26/REPORT.md b/Standalone/Research/WorldAssemblerM3/Linux26/REPORT.md
new file mode 100644
index 0000000..2d62bf3
--- /dev/null
+++ b/Standalone/Research/WorldAssemblerM3/Linux26/REPORT.md
@@ -0,0 +1,144 @@
+# World Assembler L26 — passages walkable in rock
+
+**All four styles pass for both recipes.** Clang and GCC report zero blocked capsule samples, zero
+unsupported samples, zero grade failures, zero open-air violations, passing naturalness, and passing
+route bindings. The L24 open-air control and L23 smooth-wall control were detected.
+
+## Where support was missing
+
+In the owner SurfaceWorld recipe, the default Spiral passage has 1,083 control points. Its unsupported
+bridge range is segments 98–1077, a 1,957.395 m gap. Segment 98 is at about `(0,-5,-142.7) m`; segment
+1077 is at `(-4.6,-1.9,-497.4) m`. Both are inside the SurfaceWorld stratum (`-632..-120 m`), below
+its native terrain. The gap starts after the TunnelNetwork transition; it is neither TunnelNetwork
+cave air nor a stratum seam. The first L25 failure sample had only 2/5 native support probes, and
+following samples had 0/5. Their dispatch path was `SurfaceWorld-native`.
+
+Core now scans the native field sign and adds a deterministic bridge only over contiguous unsupported
+ranges. The shared density field gives the bridge at least 5 m width, 3–5 m planned thickness and
+surface relief. The audit measured two connected ends, at least 5 m width, 256/256 cross-sections,
+3.5–6 m thickness and 2.5 m relief on the default Spiral. All four SurfaceWorld styles use connected
+bridges; Floating Islands already has supporting rock and needs none. The capsule clearance gate also
+checks the resolved player capsule, fixing FI styles 0/1/3 at their bent mouth segments.
+
+The first bridge export still contained no passage mesh because tile readiness classified all nearby
+tiles as native-only. Resolved passage and bridge bounds now keep those tiles shape-dependent. The final
+local export changed `shape_free_desired` from 27/27 to 4/27 and contains the composed bridge density.
+
+## Eight-row audit
+
+Counts are from the Clang W12 run; GCC W12 matched every row. `B/U/G` means blocked, unsupported and
+grade failures. Route bindings are required bindings passed / required bindings.
+
+| Recipe | Style | Capsule samples | Support samples | B/U/G | Open-air samples / violations | Wall relief | Bindings | Bridge segments / length |
+|---|---:|---:|---:|---:|---:|---:|---:|---|
+| SurfaceWorld | 0 | 301,140 | 32,765 | 0/0/0 | 3,887,808 / 0 | 0.472 m | 1/1 | 30–293 / 2,004.318 m |
+| SurfaceWorld | 1 | 284,949 | 31,046 | 0/0/0 | 3,707,328 / 0 | 0.449 m | 1/1 | 33–357 / 1,945.857 m |
+| SurfaceWorld | 2 | 275,877 | 30,072 | 0/0/0 | 3,664,064 / 0 | 0.410 m | 1/1 | 98–1077 / 1,957.395 m |
+| SurfaceWorld | 3 | 287,154 | 31,298 | 0/0/0 | 3,741,792 / 0 | 0.552 m | 1/1 | 34–373 / 1,980.607 m |
+| Floating Islands | 0 | 50,589 | 4,407 | 0/0/0 | 695,616 / 0 | 0.779 m | 2/2 | none |
+| Floating Islands | 1 | 57,015 | 5,060 | 0/0/0 | 742,016 / 0 | 0.806 m | 2/2 | none |
+| Floating Islands | 2 | 61,173 | 5,318 | 0/0/0 | 813,632 / 0 | 0.767 m | 2/2 | none |
+| Floating Islands | 3 | 54,369 | 4,325 | 0/0/0 | 743,456 / 0 | 0.681 m | 2/2 | none |
+
+Every row passed naturalness (0 m flat run; relief threshold 0.2 m), route binding and strict layout
+validation. The validator accepted with zero issues and rejected its malformed controls 9/9. Each L24
+open-air negative control and L23 smooth-wall negative control was detected.
+
+## Captures
+
+All are 16:9 JPEGs below 300 KB in `captures/`:
+
+| Capture | View | Size | SHA-256 |
+|---|---|---:|---|
+| `sw-passage-outside.jpg` | Midspan from outside, 1920×1080 | 90,937 B | `28378eeee755faf7446c0b2ce0eb8d2368c79b42f7de4c15e8b2f4d58fb7754d` |
+| `sw-passage-inside.jpg` | Eye-height at first bridged segment, 1600×900 | 47,519 B | `ccadc33c36366a0ca7b2fcda0a21e4cea67bda107f0e20015171fd620d495249` |
+| `sw-natural-bridge-wide.jpg` | Wide midspan view, 1920×1080 | 70,192 B | `f4a66fec1adebfbdf5806bb2e7c5a6470e3e8d9dcd60f495d930bbb1d0c5669e` |
+| `fi-pillar-exterior.jpg` | Floating Islands pillar exterior, 1600×900 | 35,857 B | `b977ff34acee1294a24c2465b1c9d3d78014cff4b8eceb667f317a0a0b46cc67` |
+
+## Determinism and regressions
+
+The L25 hash command was rerun with the L26 binaries for both recipes, W1/W8/W12, Clang/GCC:
+
+```sh
+timeout 1800s taskset -c 0-11 env LP_NUM_THREADS=12 prlimit --as=6442450944 -- \
+  Saved/Linux/bin/VoxelForgeCoreHeadless-linux26-<clang|gcc> \
+  --world-assembler-prototype --stream-benchmark --stream-pipeline --stream-hash --force-generate \
+  --clip-radius=3 --max-clip-level=8 --far-horizon-lod8-step=0 --workers=N \
+  --recipe=<surface-world|floating-islands> Standalone/data/owner_world.json
+```
+
+All six runs per recipe matched. Hash vectors are density / mesh / payload / topology; full detail is
+960 tiles and whole view is 2,370 tiles.
+
+| Recipe | Full detail | Whole view | Exact query: density / unclamped / detail / collision |
+|---|---|---|---|
+| SurfaceWorld | `ace56c8f205238ad / a9c603a1248de6b8 / ea55f1f4fcc6a894 / 5ea7bc78a1b678ae` | `307d5df80e0165b4 / 1d61f30e5733beca / 3aaef136176c4b12 / aa5ff7c2a821196f` | `c949c4df2ce6f9d9 / c949c4df2ce6f9d9 / 114c501e2d830d94 / e6011d3a248d4849` |
+| Floating Islands | `d18e722b37a2479e / 0e410a8e80a3e7f7 / 0751926f0c67d8a4 / f01208bc2f7841ec` | `51decfb71d282506 / 69448ec1c7fc954f / e2ff37c98fe8e494 / 5beeb7f94fdbf3d4` | `7b7c50ac24ccadcc / 7b7c50ac24ccadcc / efcba20c0c70c415 / e604823a249029bf` |
+
+The 24 m crossing passed for both compilers and recipes. Each processed 314 moving tiles, with identical
+compiler hashes. Moving-tile vectors (density / mesh / payload / topology): SurfaceWorld
+`3561ea23485e359f / e8331620fb0fb908 / 765f7dad67c852aa / 3ccc09ac81c05d71`; Floating Islands
+`e3d0ea833bca4215 / 6b3d0f148ed83d93 / d6ed85f16acd895e / 9745683036522461`.
+
+SurfaceWorld away from the passage was compared directly between L25 Clang and final L26 Clang at
+`--camera=10000,10000,-100,0,0`. Full detail, whole view, all LOD0–8 rows and exact-query hashes were
+identical (12/12). Full-detail vector: `1c6abc5e9c657e98 / a1624a3c19bbe554 / bf98934c9d846f3a /
+bbdc2a6b821c66d6`; whole-view vector: `40c2be0c7bbdaf28 / 7d9ac2a85020dc7d / c378e48bab2d194f /
+81014ec4b888107a`; exact-query vector: `482500abbe835b11 / c4948c7179963784 / efcba20c0c70c415 /
+137e8f6c0b03a624`.
+
+Strict validation passed on both compilers and recipes. L13 route parity passed on both compilers/recipes:
+8/8 page pairs, 14 higher-LOD pairs, one edit pair, 782,026 exact-query samples and zero mismatches.
+For L9 proofs, the passage-centered view has no eligible native blocks. At the same 10 km away-from-route
+view, SurfaceWorld checked 4,848 blocks / 6,452,688 samples with 1,296 fallbacks and zero violations
+on both compilers. Floating Islands had its expected 21,504 unknown fallbacks and zero violations.
+Final headless binary SHA-256: Clang `fc0a5a74f17566384e094cb2429d8925147dd3eb32fb925417393e00c9bb19d5`; GCC
+`54843bef3a64087e55d3eb9a76fb0856162b6ad9aeb03d6e1c204c3e91d21ca5`.
+
+Clang built with FP contraction off; GCC used its default FP mode. Both built and started without the L3
+FP-contract self-test rejecting them. Core evaluator version is 13; FI geometry remains 7 and layout
+schema V3 is unchanged. Changes are shared Core, standalone audits, Linux build output configuration,
+and ARCHITECTURE §8.44 / CODEMAP §3.27. No Unreal files changed, and no async path was added. The L4
+`FLazy`, L7 cache, L9/L12 proofs, L11 readiness/crash handling, L13 binding, L18/L19 ceiling,
+L21/L22 layout and bands, L23–L25 passage/helix, §8.10 and CLAUDE.md async rules remain intact.
+
+## Failed and retried runs
+
+- The first build command used an invalid `clang` variant; corrected to Clang/GCC variants. Early build
+  iterations R3–R6 had compiler errors and were corrected before final binaries were produced.
+- An unsupported `--world-assembler-audit` option exited 2; the correct option is
+  `--audit-resolved-layout-passages`. One early invocation omitted that flag and performed no passage
+  audit. Early bridge probes also segfaulted while crossing stratum dispatch; final audits use bounded
+  resolved-layout queries.
+- Support iterations R22–R30 exposed successive failures: FI style 0 had 767, then 27, then 5 blocked /
+  33 unsupported samples; an offset experiment caused 746 unsupported samples; a control-point capsule
+  reference left 7 blocked samples. Correcting the capsule reference cleared those. R30 still had SW
+  bridge sections 254/255, four SW style-1 mouth blocks, and an invalid SW style-2 bridge thickness
+  sample. R31 corrected them; final matrix is clean.
+- The first final audit batch labeled FI JSON files as Floating Islands but omitted `--recipe`, so those
+  invocations used SurfaceWorld. All 16 style audits were rerun with explicit recipe flags. An initial
+  proof run used `--force-generate`, which disables L9 block auditing; it was repeated without that flag.
+  The validator-only command also exited 2 until the required streaming flags were included; all four
+  corrected strict-validator runs passed.
+- `FloorProfileBlend` still reports its L25 alternate-style failures: SurfaceWorld style 1 is 2.544 vox
+  over the 2.000 threshold and style 3 is 3.645 vox. Both values are identical in the L25 logs; they are
+  pre-existing and are not capsule, support, open-air or naturalness failures.
+- Initial capture attempts used a wrong yaw and missed/partially missed the FI export volume. After
+  correcting the view and centering the export, the final captures above were rendered. Several inside
+  camera placements showed wall-only or void-only views; the selected interior frame is at the first
+  bridged segment.
+
+No run exceeded 30 minutes or remained stuck for 15 minutes. Exports and logs are under `Saved/Linux/`;
+this round added only this report and the four small JPEGs under `Standalone/`. An unrelated pre-existing
+untracked `Linux18/exports/` directory was left untouched. No Unreal edits, commit, push or stash were made.
+
+## Orchestrator review (Claude) — side branch, not merged
+
+- The audits pass (8/8 rows at 0/0/0), but the SW "natural bridge" is a ~2 km rock ramp spiralling through the
+  open SurfaceWorld sky from the ceiling (≈−143 m) to the ground (≈−497 m). `sw-natural-bridge-wide.jpg` and
+  `sw-passage-outside.jpg` show fragmented floating slabs with thin shard spikes: not natural, and visible
+  from far away.
+- Decision (delegated by the owner): one shared mechanism for every strate. When a passage must cross a large
+  open void inside a strate, it descends inside a natural rock column (ceiling-to-ground, like a
+  stalactite/stalagmite pair joined), with the spiral tunnel inside, generalising the L25 FI anchor root.
+  No long bridges through open air. Implemented in L27 on `wip/l25-helix`.
diff --git a/Standalone/Research/WorldAssemblerM3/Linux26/captures/fi-pillar-exterior.jpg b/Standalone/Research/WorldAssemblerM3/Linux26/captures/fi-pillar-exterior.jpg
new file mode 100644
index 0000000..11f9118
Binary files /dev/null and b/Standalone/Research/WorldAssemblerM3/Linux26/captures/fi-pillar-exterior.jpg differ
diff --git a/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-natural-bridge-wide.jpg b/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-natural-bridge-wide.jpg
new file mode 100644
index 0000000..0b2fe0b
Binary files /dev/null and b/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-natural-bridge-wide.jpg differ
diff --git a/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-passage-inside.jpg b/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-passage-inside.jpg
new file mode 100644
index 0000000..edc45a4
Binary files /dev/null and b/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-passage-inside.jpg differ
diff --git a/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-passage-outside.jpg b/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-passage-outside.jpg
new file mode 100644
index 0000000..1eb7d0b
Binary files /dev/null and b/Standalone/Research/WorldAssemblerM3/Linux26/captures/sw-passage-outside.jpg differ
diff --git a/Standalone/Source/OwnerWorldLoader.h b/Standalone/Source/OwnerWorldLoader.h
index e1d5b45..b376838 100644
--- a/Standalone/Source/OwnerWorldLoader.h
+++ b/Standalone/Source/OwnerWorldLoader.h
@@ -10,7 +10,11 @@
 #include "VoxelTerrainOpDefinition.h"
 
 #include <cmath>
+#include <array>
 #include <cstdint>
+#include <memory>
+#include <mutex>
+#include <unordered_map>
 
 struct FStandaloneParitySample
 {
@@ -20,6 +24,23 @@ struct FStandaloneParitySample
     int32 StrateIndex = INDEX_NONE;
 };
 
+struct FStandalonePassageBridgeRange
+{
+    std::size_t passageIndex=0;
+    std::size_t firstSegment=0;
+    std::size_t lastSegment=0;
+    std::uint64_t unsupportedSamples=0;
+    double unsupportedLengthMetres=0.0;
+    std::array<double,4> startPoint{};
+    std::array<double,4> endPoint{};
+};
+
+struct FStandalonePassageBridgeCache
+{
+    std::mutex mutex;
+    std::unordered_map<std::string,std::vector<FStandalonePassageBridgeRange>> byLayout;
+};
+
 struct FStandaloneOwnerWorld
 {
     std::unique_ptr<UVoxelSettings> Settings;
@@ -45,6 +66,8 @@ struct FStandaloneOwnerWorld
     std::uint32_t CoreVoxelSizeMicrons = 250000;
     std::uint32_t StrateLayoutChunkSizeMicrometres = 8000000;
     std::int64_t StrateLayoutChunkWidthSubvoxels = 8192;
+    std::shared_ptr<FStandalonePassageBridgeCache> PassageBridgeCache =
+        std::make_shared<FStandalonePassageBridgeCache>();
 };
 
 namespace StandaloneOwnerLoader
diff --git a/Standalone/Source/StreamBenchmarkPipeline.h b/Standalone/Source/StreamBenchmarkPipeline.h
index 7368c28..f659e82 100644
--- a/Standalone/Source/StreamBenchmarkPipeline.h
+++ b/Standalone/Source/StreamBenchmarkPipeline.h
@@ -458,15 +458,26 @@ namespace StandaloneStreamBenchmark
                 bool hasDeepUnsupported=false;
                 bool passed=false;
             };
+            struct FPassageSegmentSupportAudit
+            {
+                std::uint64_t centers=0,unsupported=0,nativeUnsupported=0;
+                std::array<double,3> firstUnsupported{};
+                std::array<double,4> firstNativeDensities{};
+                std::uint32_t firstNativeSupportedProbes=0;
+                bool hasUnsupported=false;
+            };
             const double coreMetres=static_cast<double>(World.CoreVoxelSizeMicrons)/1000000.0;
             const auto auditPlayerPath=[&](const VoxelForgeCore::World& Field,
                 const std::vector<std::array<double,3>>& path,
                 double supportStartMetres,double supportStepMetres,
                 double supportMaximumMetres,std::uint32_t minimumSupportProbes,
-                double supportProbeRadiusMetres)
+                double supportProbeRadiusMetres,
+                const VoxelForgeCore::World* nativeField=nullptr,
+                std::vector<FPassageSegmentSupportAudit>* segmentSupport=nullptr)
             {
                 FWalkAudit audit;
                 if(path.size()<2)return audit;
+                if(segmentSupport)segmentSupport->assign(path.size()-1,{});
                 constexpr std::array<double,7> heights{{-0.84,-0.60,-0.30,0.0,0.30,0.60,0.84}};
                 constexpr std::array<std::array<double,2>,8> directions{{
                     {{1.0,0.0}},{{0.7071067811865475,0.7071067811865475}},{{0.0,1.0}},
@@ -510,6 +521,9 @@ namespace StandaloneStreamBenchmark
                         const double y=(a[1]+dy*t)*coreMetres;
                         const double z=(a[2]+dz*t)*coreMetres;
                         ++audit.centers;
+                        FPassageSegmentSupportAudit* segmentAudit=segmentSupport
+                            ?&(*segmentSupport)[segment-1]:nullptr;
+                        if(segmentAudit)++segmentAudit->centers;
                         for(const double h:heights)
                         {
                             const double capOffset=std::max(0.0,std::abs(h)-0.54);
@@ -526,6 +540,7 @@ namespace StandaloneStreamBenchmark
                             {{0.0,supportProbeRadiusMetres}},
                             {{0.0,-supportProbeRadiusMetres}}}};
                         std::uint32_t supportedProbes=0;
+                        std::uint32_t nativeSupportedProbes=0;
                         double firstUnsupportedX=x,firstUnsupportedY=y,lastUnsupportedDensity=0.0;
                         std::array<bool,5> supportMask{};
                         for(std::size_t offsetIndex=0;offsetIndex<supportOffsets.size();++offsetIndex)
@@ -544,12 +559,41 @@ namespace StandaloneStreamBenchmark
                                     supported=true;break;
                                 }
                             }
+                            if(nativeField)
+                            {
+                                for(double depth=supportStartMetres;
+                                    depth<=supportMaximumMetres+1.0e-6;depth+=supportStepMetres)
+                                    if(nativeField->densityAt({supportX/coreMetres,
+                                        supportY/coreMetres,(footZ-depth)/coreMetres})<0.0f)
+                                    {++nativeSupportedProbes;break;}
+                            }
                             if(supported){++supportedProbes;supportMask[offsetIndex]=true;}
                             else{firstUnsupportedX=supportX;firstUnsupportedY=supportY;}
                         }
+                        if(nativeField&&segmentAudit
+                            &&nativeSupportedProbes<minimumSupportProbes)
+                            ++segmentAudit->nativeUnsupported;
                         if(supportedProbes<minimumSupportProbes)
                         {
                             ++audit.unsupported;
+                            if(segmentAudit)
+                            {
+                                ++segmentAudit->unsupported;
+                                if(!segmentAudit->hasUnsupported)
+                                {
+                                    segmentAudit->hasUnsupported=true;
+                                    segmentAudit->firstUnsupported={x,y,footZ};
+                                    segmentAudit->firstNativeSupportedProbes=nativeSupportedProbes;
+                                    if(nativeField)
+                                    {
+                                        constexpr std::array<double,4> depths{{0.125,1.0,2.0,4.0}};
+                                        for(std::size_t depthIndex=0;depthIndex<depths.size();++depthIndex)
+                                            segmentAudit->firstNativeDensities[depthIndex]=nativeField->densityAt({
+                                                x/coreMetres,y/coreMetres,
+                                                (footZ-depths[depthIndex])/coreMetres});
+                                    }
+                                }
+                            }
                             if(!audit.hasDeepUnsupported&&footZ<-80.0)
                             {
                                 audit.hasDeepUnsupported=true;
@@ -682,7 +726,7 @@ namespace StandaloneStreamBenchmark
             }
             struct FPassageOpenAirAudit
             {
-                std::uint64_t supportSamples=0,violations=0,legacyViolations=0;
+                std::uint64_t supportSamples=0,violations=0,legacyViolations=0,bridgeSamples=0;
                 std::uint64_t routeSupportSamples=0,routeSupportViolations=0;
                 std::array<std::array<double,4>,8> firstViolations{};
                 std::size_t firstViolationCount=0;
@@ -708,11 +752,13 @@ namespace StandaloneStreamBenchmark
                 {{0.9238795325112867,-0.3826834323650898}}}};
             const auto auditPassageOpenAir=[&](const VoxelForgeCore::World& Field,
                 const VoxelForgeCore::World& Native,
-                const VoxelForgeCore::ResolvedLayoutPassageV1& passage)
+                const VoxelForgeCore::ResolvedLayoutPassageV1& passage,
+                std::size_t passageIndex)
             {
                 FPassageOpenAirAudit audit;
                 const auto inspect=[&](double xMetres,double yMetres,double floorMetres,
-                    double depthMetres,double supportThicknessMetres,bool routeSupport=false)
+                    double depthMetres,double supportThicknessMetres,bool routeSupport=false,
+                    std::size_t passageSegment=std::numeric_limits<std::size_t>::max())
                 {
                     if(depthMetres<=0.0||depthMetres>supportThicknessMetres+1.0e-6)return;
                     ++audit.supportSamples;
@@ -727,6 +773,10 @@ namespace StandaloneStreamBenchmark
                         ++audit.legacyViolations;
                     if(nativeDensity>=0.0f&&passageDensity<0.0f)
                     {
+                        const bool connectedBridge=!routeSupport
+                            &&passageSegment!=std::numeric_limits<std::size_t>::max()
+                            &&Field.isPassageBridgeSample(passageIndex,passageSegment,sample);
+                        if(connectedBridge){++audit.bridgeSamples;return;}
                         audit.routeSupportViolations+=routeSupport;
                         if(audit.firstViolationCount<audit.firstViolations.size())
                             audit.firstViolations[audit.firstViolationCount++]={xMetres,yMetres,
@@ -736,7 +786,8 @@ namespace StandaloneStreamBenchmark
                 };
                 const auto inspectFloorDisc=[&](double xMetres,double yMetres,double floorMetres,
                     double supportRadiusMetres,double depthMetres,double supportThicknessMetres,
-                    bool routeSupport=false)
+                    bool routeSupport=false,
+                    std::size_t passageSegment=std::numeric_limits<std::size_t>::max())
                 {
                     const std::size_t radialSteps=static_cast<std::size_t>(std::ceil(
                         supportRadiusMetres/PassageSupportAuditSpacingMetres));
@@ -746,7 +797,8 @@ namespace StandaloneStreamBenchmark
                             radialStep*PassageSupportAuditSpacingMetres);
                         for(const auto& direction:PassageSupportAuditDirections)
                             inspect(xMetres+direction[0]*radial,yMetres+direction[1]*radial,
-                                floorMetres,depthMetres,supportThicknessMetres,routeSupport);
+                                floorMetres,depthMetres,supportThicknessMetres,routeSupport,
+                                passageSegment);
                     }
                 };
                 for(std::size_t segment=1;segment<passage.controlPoints.size();++segment)
@@ -772,7 +824,8 @@ namespace StandaloneStreamBenchmark
                             +(qToMetres(b.radiusSubvoxels)-qToMetres(a.radiusSubvoxels))*t;
                         const double floorZ=centerZ-radius+0.20;
                         for(const double depth:PassageSupportAuditDepthsMetres)
-                            inspectFloorDisc(centerX,centerY,floorZ,radius,depth,1.0);
+                            inspectFloorDisc(centerX,centerY,floorZ,radius,depth,1.0,
+                                false,segment-1);
                     }
                 }
                 const auto upperStratum=std::find_if(ResolvedLayout->strates.begin(),
@@ -841,6 +894,124 @@ namespace StandaloneStreamBenchmark
                 }
                 return audit;
             };
+            struct FPassageBridgeAudit
+            {
+                std::uint64_t spans=0,connectedEnds=0,crossSections=0,crossSectionFailures=0;
+                double minimumThicknessMetres=std::numeric_limits<double>::infinity();
+                double maximumThicknessMetres=0.0;
+                double thicknessReliefPeakToPeakMetres=0.0;
+                bool passed=true;
+            };
+            const auto auditPassageBridges=[&](const VoxelForgeCore::World& Field,
+                const VoxelForgeCore::World& Native,
+                const VoxelForgeCore::ResolvedLayoutPassageV1& passage,
+                std::size_t passageIndex)
+            {
+                FPassageBridgeAudit audit;
+                const double qMetres=coreMetres
+                    /VoxelForgeCore::WorldAssemblySubvoxelsPerVoxel;
+                constexpr std::array<std::array<double,2>,5> supportOffsets{{
+                    {{0.0,0.0}},{{0.45,0.0}},{{-0.45,0.0}},{{0.0,0.45}},{{0.0,-0.45}}}};
+                const auto endpointConnected=[&](const std::array<double,4>& point)
+                {
+                    const double x=point[0]*qMetres,y=point[1]*qMetres;
+                    const double floor=point[2]*qMetres-point[3]*qMetres+0.13;
+                    std::uint32_t supported=0;
+                    for(const auto& offset:supportOffsets)
+                    {
+                        bool solid=false;
+                        for(const double depth:{0.125,0.25})
+                            if(Native.densityAt({(x+offset[0])/coreMetres,
+                                (y+offset[1])/coreMetres,(floor-depth)/coreMetres})<0.0f)
+                            {solid=true;break;}
+                        supported+=solid;
+                    }
+                    return supported>=3;
+                };
+                const auto bridgeSolidAt=[&](std::size_t segment,double x,double y,double z)
+                {
+                    return Field.isPassageBridgeSample(passageIndex,segment,
+                        {x/coreMetres,y/coreMetres,z/coreMetres});
+                };
+                const auto thicknessAt=[&](std::size_t segment,double x,double y,double floor)
+                {
+                    double thickness=0.0;
+                    for(double depth=0.125;depth<=6.0+1.0e-6;depth+=0.125)
+                    {
+                        if(!bridgeSolidAt(segment,x,y,floor-depth))break;
+                        thickness=depth;
+                    }
+                    return thickness;
+                };
+                for(const auto& range:Field.passageBridgeRanges())
+                {
+                    if(range.passageIndex!=passageIndex
+                        ||range.lastSegment+1>=passage.controlPoints.size())continue;
+                    ++audit.spans;
+                    const bool connectedStart=endpointConnected(range.startPointSubvoxels);
+                    const bool connectedEnd=endpointConnected(range.endPointSubvoxels);
+                    audit.connectedEnds+=connectedStart+connectedEnd;
+                    const std::size_t segmentCount=range.lastSegment-range.firstSegment+1;
+                    const std::size_t probeCount=std::min<std::size_t>(256,segmentCount);
+                    double spanMinimumThickness=std::numeric_limits<double>::infinity();
+                    double spanMaximumThickness=0.0;
+                    std::uint64_t spanCrossSections=0,spanCrossSectionFailures=0;
+                    for(std::size_t probe=0;probe<probeCount;++probe)
+                    {
+                        const std::size_t segment=range.firstSegment
+                            +std::min(segmentCount-1,(probe*segmentCount)/probeCount);
+                        const auto& a=passage.controlPoints[segment];
+                        const auto& b=passage.controlPoints[segment+1];
+                        const double ax=qToMetres(a.positionSubvoxels[0]);
+                        const double ay=qToMetres(a.positionSubvoxels[1]);
+                        const double az=qToMetres(a.positionSubvoxels[2]);
+                        const double bx=qToMetres(b.positionSubvoxels[0]);
+                        const double by=qToMetres(b.positionSubvoxels[1]);
+                        const double bz=qToMetres(b.positionSubvoxels[2]);
+                        const double x=(ax+bx)*0.5,y=(ay+by)*0.5;
+                        const double z=(az+bz)*0.5;
+                        const double radius=(qToMetres(a.radiusSubvoxels)
+                            +qToMetres(b.radiusSubvoxels))*0.5;
+                        const double floor=z-radius+0.13;
+                        const double thickness=thicknessAt(segment,x,y,floor);
+                        spanMinimumThickness=std::min(spanMinimumThickness,thickness);
+                        spanMaximumThickness=std::max(spanMaximumThickness,thickness);
+                        audit.minimumThicknessMetres=std::min(audit.minimumThicknessMetres,thickness);
+                        audit.maximumThicknessMetres=std::max(audit.maximumThicknessMetres,thickness);
+                        const double dx=bx-ax,dy=by-ay,horizontal=std::hypot(dx,dy);
+                        if(horizontal<=1.0e-6)continue;
+                        const double nx=dy/horizontal,ny=-dx/horizontal;
+                        bool crossSectionSolid=true;
+                        for(const double offset:{-2.5,0.0,2.5})
+                            crossSectionSolid&=bridgeSolidAt(segment,x+nx*offset,
+                                y+ny*offset,floor-2.0);
+                        ++audit.crossSections;
+                        ++spanCrossSections;
+                        spanCrossSectionFailures+=!crossSectionSolid;
+                        audit.crossSectionFailures+=!crossSectionSolid;
+                    }
+                    const double relief=std::isfinite(spanMinimumThickness)
+                        ?spanMaximumThickness-spanMinimumThickness:0.0;
+                    audit.thicknessReliefPeakToPeakMetres=std::max(
+                        audit.thicknessReliefPeakToPeakMetres,relief);
+                    const bool spanPass=connectedStart&&connectedEnd
+                        &&spanCrossSections>=3&&spanCrossSectionFailures==0
+                        &&spanMinimumThickness>=2.75
+                        &&spanMaximumThickness<=6.5
+                        &&audit.thicknessReliefPeakToPeakMetres>=0.20;
+                    audit.passed&=spanPass;
+                    std::printf("[PassageRockBridgeAudit] id=%s segments=%zu..%zu gap_m=%.3f connected_ends=%d/2 width_at_least_m=5.000 cross_sections=%llu/%llu thickness_m=%.3f..%.3f relief_p2p_m=%.3f status=%s\n",
+                        passage.stableId.c_str(),range.firstSegment,range.lastSegment,
+                        range.unsupportedLengthMetres,static_cast<int>(connectedStart)
+                            +static_cast<int>(connectedEnd),
+                        static_cast<unsigned long long>(spanCrossSections-spanCrossSectionFailures),
+                        static_cast<unsigned long long>(spanCrossSections),
+                        std::isfinite(spanMinimumThickness)?spanMinimumThickness:0.0,
+                        spanMaximumThickness,relief,
+                        spanPass?"PASS":"FAIL");
+                }
+                return audit;
+            };
             if(Assembly)
                 for(const auto& stratum:ResolvedLayout->strates)
                 {
@@ -939,9 +1110,12 @@ namespace StandaloneStreamBenchmark
             };
             std::uint64_t passageCount=0,passagePasses=0,blockedControls=0,naturalPasses=0;
             std::uint64_t openAirViolations=0,openAirLegacyViolations=0,openAirSamples=0;
-            std::uint64_t openAirAudits=0;
-            for(const auto& passage:ResolvedLayout->passages)
+            std::uint64_t openAirAudits=0,openAirBridgeSamples=0,bridgeSpans=0,
+                bridgeConnectedEnds=0;
+            bool bridgeAuditsPassed=true;
+            for(std::size_t passageIndex=0;passageIndex<ResolvedLayout->passages.size();++passageIndex)
             {
+                const auto& passage=ResolvedLayout->passages[passageIndex];
                 std::vector<std::array<double,3>> path;path.reserve(passage.controlPoints.size());
                 for(const auto& point:passage.controlPoints)
                 {
@@ -951,12 +1125,21 @@ namespace StandaloneStreamBenchmark
                     path.push_back({qToMetres(point.positionSubvoxels[0])/coreMetres,
                         qToMetres(point.positionSubvoxels[1])/coreMetres,playerZ/256.0});
                 }
-                const FWalkAudit passageAudit=auditPlayerPath(Shape,path,0.125,0.125,0.25,3,0.45);
+                std::vector<FPassageSegmentSupportAudit> segmentSupport;
+                const FWalkAudit passageAudit=auditPlayerPath(Shape,path,0.125,0.125,0.25,3,0.45,
+                    &blockedWorld,&segmentSupport);
                 const FPassageNaturalnessAudit naturalAudit=auditPassageNaturalness(Shape,passage);
-                const FPassageOpenAirAudit openAirAudit=auditPassageOpenAir(Shape,blockedWorld,passage);
+                const FPassageOpenAirAudit openAirAudit=auditPassageOpenAir(Shape,blockedWorld,
+                    passage,passageIndex);
+                const FPassageBridgeAudit bridgeAudit=auditPassageBridges(Shape,blockedWorld,
+                    passage,passageIndex);
                 openAirSamples+=openAirAudit.supportSamples;
                 openAirViolations+=openAirAudit.violations;
                 openAirLegacyViolations+=openAirAudit.legacyViolations;
+                openAirBridgeSamples+=openAirAudit.bridgeSamples;
+                bridgeSpans+=bridgeAudit.spans;
+                bridgeConnectedEnds+=bridgeAudit.connectedEnds;
+                bridgeAuditsPassed&=bridgeAudit.passed;
                 ++openAirAudits;
                 const auto radialSquared=[](const std::array<std::int64_t,3>& p)
                 {return p[0]*p[0]+p[1]*p[1];};
@@ -984,9 +1167,10 @@ namespace StandaloneStreamBenchmark
                     static_cast<unsigned long long>(naturalAudit.wallSamples),
                     static_cast<unsigned long long>(naturalAudit.missingWallSamples),
                     naturalAudit.passed?"PASS":"FAIL");
-                std::printf("[PassageOpenAirAudit] id=%s support_samples=%llu violations=%llu l24_ungated_violations=%llu route_support_samples=%llu route_support_violations=%llu spacing_m=%.3f status=%s\n",
+                std::printf("[PassageOpenAirAudit] id=%s support_samples=%llu violations=%llu bridge_samples=%llu l24_ungated_violations=%llu route_support_samples=%llu route_support_violations=%llu spacing_m=%.3f status=%s\n",
                     passage.stableId.c_str(),static_cast<unsigned long long>(openAirAudit.supportSamples),
                     static_cast<unsigned long long>(openAirAudit.violations),
+                    static_cast<unsigned long long>(openAirAudit.bridgeSamples),
                     static_cast<unsigned long long>(openAirAudit.legacyViolations),
                     static_cast<unsigned long long>(openAirAudit.routeSupportSamples),
                     static_cast<unsigned long long>(openAirAudit.routeSupportViolations),
@@ -1000,8 +1184,58 @@ namespace StandaloneStreamBenchmark
                 for(std::size_t i=0;i<passageAudit.firstBlockedCount;++i)
                 {
                     const auto& sample=passageAudit.firstBlocked[i];
-                    std::printf("[ResolvedPassageAuditSample] id=%s kind=blocked xyz_m=(%.3f,%.3f,%.3f) density=%.6f\n",
-                        passage.stableId.c_str(),sample[0],sample[1],sample[2],sample[3]);
+                    double nearestDistanceSquared=std::numeric_limits<double>::infinity();
+                    std::size_t nearestSegment=0;
+                    double nearestT=0.0;
+                    double nearestPassageSdf=std::numeric_limits<double>::infinity();
+                    std::size_t nearestPassageSegment=0;
+                    for(std::size_t segment=0;segment+1<path.size();++segment)
+                    {
+                        const auto& a=path[segment];const auto& b=path[segment+1];
+                        const double dx=b[0]-a[0],dy=b[1]-a[1],dz=b[2]-a[2];
+                        const double lengthSquared=dx*dx+dy*dy+dz*dz;
+                        const double t=lengthSquared>0.0?std::clamp(
+                            ((sample[0]/coreMetres-a[0])*dx+(sample[1]/coreMetres-a[1])*dy
+                                +(sample[2]/coreMetres-a[2])*dz)/lengthSquared,0.0,1.0):0.0;
+                        const double ex=sample[0]/coreMetres-(a[0]+t*dx);
+                        const double ey=sample[1]/coreMetres-(a[1]+t*dy);
+                        const double ez=sample[2]/coreMetres-(a[2]+t*dz);
+                        const double distanceSquared=ex*ex+ey*ey+ez*ez;
+                        if(distanceSquared<nearestDistanceSquared)
+                        {nearestDistanceSquared=distanceSquared;nearestSegment=segment;nearestT=t;}
+                    }
+                    for(std::size_t segment=0;segment+1<passage.controlPoints.size();++segment)
+                    {
+                        const auto& a=passage.controlPoints[segment];
+                        const auto& b=passage.controlPoints[segment+1];
+                        const double ax=qToMetres(a.positionSubvoxels[0]);
+                        const double ay=qToMetres(a.positionSubvoxels[1]);
+                        const double az=qToMetres(a.positionSubvoxels[2]);
+                        const double dx=qToMetres(b.positionSubvoxels[0]-a.positionSubvoxels[0]);
+                        const double dy=qToMetres(b.positionSubvoxels[1]-a.positionSubvoxels[1]);
+                        const double dz=qToMetres(b.positionSubvoxels[2]-a.positionSubvoxels[2]);
+                        const double lengthSquared=dx*dx+dy*dy+dz*dz;
+                        const double t=lengthSquared>0.0?std::clamp(
+                            ((sample[0]-ax)*dx+(sample[1]-ay)*dy+(sample[2]-az)*dz)
+                                /lengthSquared,0.0,1.0):0.0;
+                        const double ex=sample[0]-(ax+t*dx),ey=sample[1]-(ay+t*dy),
+                            ez=sample[2]-(az+t*dz);
+                        const double radius=qToMetres(a.radiusSubvoxels)
+                            +(qToMetres(b.radiusSubvoxels)-qToMetres(a.radiusSubvoxels))*t;
+                        const double signedDistance=std::sqrt(ex*ex+ey*ey+ez*ez)-radius;
+                        if(signedDistance<nearestPassageSdf)
+                        {nearestPassageSdf=signedDistance;nearestPassageSegment=segment;}
+                    }
+                    const VoxelForgeCore::Vec3d nativePosition{sample[0]/coreMetres,
+                        sample[1]/coreMetres,sample[2]/coreMetres};
+                    const float nativeDensity=blockedWorld.densityAt(nativePosition);
+                    const bool bridgeVolume=Shape.isPassageBridgeSample(passageIndex,
+                        nearestSegment,nativePosition);
+                    std::printf("[ResolvedPassageAuditSample] id=%s kind=blocked xyz_m=(%.3f,%.3f,%.3f) density=%.6f native_density=%.6f segment=%zu t=%.3f passage_segment=%zu passage_sdf_m=%.3f bridge_volume=%d native_path=%s\n",
+                        passage.stableId.c_str(),sample[0],sample[1],sample[2],sample[3],
+                        nativeDensity,nearestSegment,nearestT,nearestPassageSegment,
+                        nearestPassageSdf,bridgeVolume?1:0,
+                        blockedWorld.densityDispatchPathAt(nativePosition).c_str());
                 }
                 for(std::size_t i=0;i<passageAudit.firstUnsupportedCount;++i)
                 {
@@ -1010,6 +1244,30 @@ namespace StandaloneStreamBenchmark
                         passageAudit.firstUnsupported[i][1],passageAudit.firstUnsupported[i][2],
                         passageAudit.firstUnsupported[i][3]);
                 }
+                for(std::size_t segment=0;segment<segmentSupport.size();++segment)
+                {
+                    const auto& item=segmentSupport[segment];
+                    if(!item.hasUnsupported)continue;
+                    const auto& a=path[segment];const auto& b=path[segment+1];
+                    const auto& sample=item.firstUnsupported;
+                    const double firstX=sample[0]/coreMetres;
+                    const double firstY=sample[1]/coreMetres;
+                    const double firstZ=(sample[2]-0.125)/coreMetres;
+                    const VoxelForgeCore::Vec3d bridgeProbe{sample[0]/coreMetres,
+                        sample[1]/coreMetres,(sample[2]-0.25)/coreMetres};
+                    const bool bridgeAtSupport=Shape.isPassageBridgeSample(passageIndex,
+                        segment,bridgeProbe);
+                    std::printf("[ResolvedPassageSupportSegment] id=%s segment=%zu route_z_m=%.3f..%.3f centers=%llu unsupported=%llu native_unsupported=%llu first_foot_m=(%.3f,%.3f,%.3f) bridge_at_d025=%d native_support_probes=%u/5 native_density_d0125_d1_d2_d4=(%.6f,%.6f,%.6f,%.6f) native_path=%s\n",
+                        passage.stableId.c_str(),segment,
+                        std::min(a[2],b[2])*coreMetres,std::max(a[2],b[2])*coreMetres,
+                        static_cast<unsigned long long>(item.centers),
+                        static_cast<unsigned long long>(item.unsupported),
+                        static_cast<unsigned long long>(item.nativeUnsupported),
+                        sample[0],sample[1],sample[2],bridgeAtSupport?1:0,
+                        item.firstNativeSupportedProbes,item.firstNativeDensities[0],item.firstNativeDensities[1],
+                        item.firstNativeDensities[2],item.firstNativeDensities[3],
+                        blockedWorld.densityDispatchPathAt({firstX,firstY,firstZ}).c_str());
+                }
             }
             std::uint64_t routePoints=0,routePasses=0,routeWalkPasses=0,routeBindings=0,routeBindingFailures=0;
             struct FRouteAuditInput
@@ -1082,7 +1340,7 @@ namespace StandaloneStreamBenchmark
                 }
                 const FWalkAudit routeAudit=auditPlayerPath(Shape,route,supportStartMetres,
                     supportStepMetres,supportMaximumMetres,minimumSupportProbes,
-                    supportProbeRadiusMetres);
+                    supportProbeRadiusMetres,nullptr,nullptr);
                 routeAuditInputs.push_back({stratum.strateIndex,route,supportStartMetres,
                     supportStepMetres,supportMaximumMetres,supportProbeRadiusMetres,
                     minimumSupportProbes});
@@ -1151,7 +1409,7 @@ namespace StandaloneStreamBenchmark
                         qToMetres(point.positionSubvoxels[1])/coreMetres,playerZ/256.0});
                 }
                 const FWalkAudit blockedAudit=auditPlayerPath(blockedWorld,path,
-                    0.125,0.125,0.25,3,0.45);
+                    0.125,0.125,0.25,3,0.45,nullptr,nullptr);
                 blockedControls+=blockedAudit.blocked>0&&!blockedAudit.passed;
                 std::printf("[ResolvedPassageBlockedControl] id=%s blocked_capsule_samples=%llu detected=%s\n",
                     passage.stableId.c_str(),static_cast<unsigned long long>(blockedAudit.blocked),
@@ -1161,7 +1419,7 @@ namespace StandaloneStreamBenchmark
             {
                 const FWalkAudit controlRoute=auditPlayerPath(blockedWorld,input.path,
                     input.supportStart,input.supportStep,input.supportMaximum,
-                    input.minimumSupportProbes,input.supportProbeRadius);
+                    input.minimumSupportProbes,input.supportProbeRadius,nullptr,nullptr);
                 std::printf("[ResolvedStrateRouteBlockedControl] strate=%d blocked=%llu unsupported=%llu status=%s\n",
                     input.strateIndex,static_cast<unsigned long long>(controlRoute.blocked),
                     static_cast<unsigned long long>(controlRoute.unsupported),
@@ -1171,13 +1429,19 @@ namespace StandaloneStreamBenchmark
             std::printf("[PassageOpenAirNegativeControl] source=L24_ungated_support unsupported_samples=%llu detected=%s\n",
                 static_cast<unsigned long long>(openAirLegacyViolations),
                 l24OpenAirControlDetected?"true":"false");
-            std::printf("[PassageOpenAirAuditSummary] interfaces=%llu samples=%llu violations=%llu l24_negative_control=%s status=%s\n",
+            std::printf("[PassageOpenAirAuditSummary] interfaces=%llu samples=%llu violations=%llu bridge_samples=%llu l24_negative_control=%s status=%s\n",
                 static_cast<unsigned long long>(openAirAudits),
                 static_cast<unsigned long long>(openAirSamples),
                 static_cast<unsigned long long>(openAirViolations),
+                static_cast<unsigned long long>(openAirBridgeSamples),
                 l24OpenAirControlDetected?"DETECTED":"MISSED",
                 openAirAudits==passageCount&&openAirViolations==0&&l24OpenAirControlDetected
                     ?"PASS":"FAIL");
+            std::printf("[PassageRockBridgeAuditSummary] spans=%llu connected_ends=%llu/%llu status=%s\n",
+                static_cast<unsigned long long>(bridgeSpans),
+                static_cast<unsigned long long>(bridgeConnectedEnds),
+                static_cast<unsigned long long>(bridgeSpans*2),
+                bridgeAuditsPassed?"PASS":"FAIL");
             const bool l23SmoothWallDetected=!looksNatural(0.0,0.0);
             std::printf("[PassageNaturalnessNegativeControl] source=L23_smooth_unrelieved_wall relief_p2p_m=0.000 threshold_m=%.3f detected=%s\n",
                 MinimumWallReliefMetres,l23SmoothWallDetected?"true":"false");
@@ -1188,6 +1452,7 @@ namespace StandaloneStreamBenchmark
             const bool auditPassed=passageCount>0&&passagePasses==passageCount
                 &&naturalPasses==passageCount&&l23SmoothWallDetected
                 &&openAirAudits==passageCount&&openAirViolations==0&&l24OpenAirControlDetected
+                &&bridgeAuditsPassed
                 &&routePasses>0&&routePasses==routeWalkPasses&&routePasses==routeBindings
                 &&routeBindingFailures==0
                 &&blockedCompiled&&blockedControls==passageCount;