Before revision: Some Subterraneaand related topics include: Natural Caves Cenote Ice cave Sea cave Sinkhole Karst Lava tube Lunar and Martian lava tubes Subterranean river Subterranean waterfall Underground lake Volcanic pipe Human-made or related Borehole Bunker Burial vault (tomb) Casemate Catacombs Cave dweller, Underground living Cave temple Cellar Dungeon Dugout (shelter) Fogou Hypogeum Mine Rock cut architecture, rock-cut tomb Smuggling tunnel Tunnels (street tunnel, train tunnels) Underground city, umbrella article for underground dwellings and facilities Underground rapid transit system Wine cave See also Boring (earth) Seattle Underground Subterranean London Reference
After revision: Some Subterranea and related topics include: Natural Caves Cenote Ice cave Sea cave Sinkhole Karst Lava tube Lunar and Martian lava tubes Subterranean river Subterranean waterfall Underground lake Volcanic pipe Human-made or related Borehole Bunker Burial vault (tomb) Casemate Catacombs Cave dweller, Underground living Cave temple Cellar Dungeon Dugout (shelter) Fogou Hypogeum Mine Rock cut architecture, rock-cut tomb Smuggling tunnel Tunnels (street tunnel, train tunnels) Underground city, umbrella article for underground dwellings and facilities Underground rapid transit system Wine cave See also Boring (earth) Seattle Underground Subterranean London Reference