diff --git a/gm4_tunnel_bores/data/gm4_tunnel_bores/tags/block/unbreakable.json b/gm4_tunnel_bores/data/gm4_tunnel_bores/tags/block/unbreakable.json
index 95acbf50ca..114a7c49d9 100644
--- a/gm4_tunnel_bores/data/gm4_tunnel_bores/tags/block/unbreakable.json
+++ b/gm4_tunnel_bores/data/gm4_tunnel_bores/tags/block/unbreakable.json
@@ -5,6 +5,7 @@
     "minecraft:air",
     "minecraft:void_air",
     "minecraft:cave_air",
+    "minecraft:ancient_debris",
     "minecraft:barrier",
     "minecraft:bedrock",
     "minecraft:end_portal",