diff --git a/blight-editor/src/main/java/de/blight/editor/state/VoxelEditorState.java b/blight-editor/src/main/java/de/blight/editor/state/VoxelEditorState.java
index 37be0a0..a3cddd3 100644
--- a/blight-editor/src/main/java/de/blight/editor/state/VoxelEditorState.java
+++ b/blight-editor/src/main/java/de/blight/editor/state/VoxelEditorState.java
@@ -597,6 +597,11 @@ public class VoxelEditorState extends BaseAppState {
         return (h & 0x7FFFFFFF) / (float) 0x7FFFFFFF;
     }
 
+    /** Gibt eine Momentaufnahme aller aktuell geladenen Chunks zurück (thread-safe). */
+    public List<VoxelChunk> getChunksSnapshot() {
+        return new java.util.ArrayList<>(chunks.values());
+    }
+
     /**
      * Speichert alle dirty Chunks synchron.
      * Kann von außen aufgerufen werden (z.B. beim globalen Speichern).
@@ -2476,20 +2481,45 @@ public class VoxelEditorState extends BaseAppState {
                             Float   smoothH = smoothMap.get(hk0);
                             if (h0 == null || smoothH == null) continue;
 
+                            // Wichtig: colX ist chunk-global (cx*CELLS+bx), kein World-X.
+                            // World-X = colX - 2048 (VoxelChunk.toWorldX-Konvention).
+                            float th = terrainH((float)(colX - 2048), (float)(colZ - 2048));
+
+                            // Pre-Scan: hat diese Spalte einen echten Tunnel?
+                            // (negative Zelle auf/über Terrain-Höhe mit festem Voxel darüber)
+                            // Tunnel-Spalten bekommen gar keinen positiven Gradienten in
+                            // negative Zellen – weder Tunnel-Void noch Unter-Terrain-Cells –
+                            // damit kein Plateau auf dem Tunnelboden entsteht.
+                            boolean hasTunnelVoid = false;
+                            outer:
+                            for (int ly = 0; ly < blurN; ly++) {
+                                if ((wiyBase + ly) >= th
+                                        && origChunk.getDensity(bx, ly, bz) < 0) {
+                                    for (int ly2 = ly + 1; ly2 < blurN; ly2++) {
+                                        if (origChunk.getDensity(bx, ly2, bz) > 0) {
+                                            hasTunnelVoid = true; break outer;
+                                        }
+                                    }
+                                }
+                            }
+
                             // Sub-voxel-genauen Dichte-Gradienten schreiben, damit MC die
                             // Isofläche auf die exakte smoothH-Höhe interpoliert.
-                            // Ausnahme: manuell ausgegrabene Voxel (Tunnel/Höhlen) behalten
-                            // ihren MIN_VALUE – erkennbar daran dass Gradient solid will (d>0)
-                            // aber die Original-Dichte bereits Luft ist (MIN_VALUE).
                             for (int by = 0; by < blurN; by++) {
-                                float d = (smoothH - (wiyBase + by)) * 127f;
-                                // Tunnel/Höhlen-Voxel schützen: Gradient will Solid (d>0),
-                                // aber der Voxel wurde ausgegraben (Dichte negativ) →
-                                // nicht mit Solid-Gradient überschreiben.
-                                // Gilt sowohl für Byte.MIN_VALUE (setDensity) als auch für
-                                // partiell-reduzierte Werte (reduceDensity im Cave-Modus).
+                                float worldY = wiyBase + by;
+                                float d = (smoothH - worldY) * 127f;
                                 if (d > 0f && origChunk.getDensity(bx, by, bz) < 0) {
-                                    continue;
+                                    if (hasTunnelVoid) continue; // Tunnel-Spalte: alle negativen Zellen schützen
+                                    if (worldY >= th) {
+                                        // Über Terrain, kein Tunnel-Flag → offene Höhle prüfen
+                                        boolean solidAbove = false;
+                                        for (int ly = by + 1; ly < blurN; ly++) {
+                                            if (origChunk.getDensity(bx, ly, bz) > 0) {
+                                                solidAbove = true; break;
+                                            }
+                                        }
+                                        if (solidAbove) continue;
+                                    }
                                 }
                                 next[c.idx(bx, by, bz)] = Math.max(-128f, Math.min(127f, d));
                             }
@@ -2604,6 +2634,15 @@ public class VoxelEditorState extends BaseAppState {
                     }
                     if (hasVoid) continue;
 
+                    // Tunnel-Check: gibt es negative (leere) Zellen UNTERHALB von yBot?
+                    // Das passiert bei Tunneln/Höhlen, deren Decke yBot ist, aber das
+                    // Innere darunter liegt. Extrapolation würde den Hohlraum zuschütten.
+                    boolean hasVoidBelow = false;
+                    for (int ly = 0; ly < yBot; ly++) {
+                        if (blurred.getDensity(lx, ly, lz) < 0) { hasVoidBelow = true; break; }
+                    }
+                    if (hasVoidBelow) continue;
+
                     // Steigung aus den zwei Voxeln darüber bestimmen.
                     // slope < 0: Dichte nimmt nach unten ab (typisch für eine Oberfläche).
                     float d1    = blurred.getDensity(lx, yBot + 1, lz);
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