Subterranea (geography)

• 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 human-related by common function ==

The following is a list of examples of structures which are or can be underground. • Civil defense • Air raid shelter • Blast shelter • Fallout shelter • Storm cellar • Cultural heritage • Catacombs • Dungeon • Erdstall • Fogou • Hypogeum • Passage grave • Rock-cut architecture • Rock-cut tomb • Disposal of corpses or religion: • Burial vault • Crypt • Living • Basement • Cave dwelling • Dugout • Earth shelter • Underground city • Maintenance • Manhole • Utility vault • Extractive activities • Mine • Quarry • Military • Bunker • Casemate • Foxhole • Missile launch facility • Spiderhole • Underground base • Underground hangar • Storage • Bank vault • Root cellar • Wine cave • Transport • Tunnel • Smuggling tunnel • Secret passage • Underground rapid transit system • Water supply, wastewater or drainage • Dry well • Stepwell • Sewerage • Well • Other or multiple functions • Borehole • Ventilation shaft ==See also==