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Films set in subterranea Fictional subterranea Fiction about underground railways Children's books set in subterranea Subterranean fiction Speleology Cave paintings Cave organisms Cave sites in Mesoamerican archaeology Caves used for hiding Grottoes Fictional caves Caving Cave geology Cave conservancies Artificial caves Caves by type Caves by country Caves by continent Caves Burial sites of noble families Ship burials Royal reburials Premature burials Prehistoric burials Burial monuments and structures Burial of Jesus Chariot burials Burials by location Burials Underground cities Tunnels Subterranean railways Stepwells Subterranean structures of Spain Labyrinths Catacombs Bunkers Subterranean structures in Bosnia and Herzegovina Bar Kokhba hiding complexes Deepest boreholes Boreholes Ancient Roman sarcophagi Mausoleums in Rome Catacombs of Rome Ancient Roman tombs and cemeteries in Rome Cemeteries and tombs in Rome Cemeteries in Italy Ancient Roman buildings and structures in Rome Death in ancient Rome Air raid shelters in the United States Air raid shelters in the United Kingdom Air raid shelters in Queensland Air raid shelters Underground rapid transit in Hong Kong Tunnels in Hong Kong MTR Caves of Hong Kong Subterranean Hong Kong Underground rapid transit in the United States Bunkers in the United States Subterranea of the United States Tunnels in the United Kingdom Subterranean railways in the United Kingdom Rapid transit in the United Kingdom Nuclear bunkers in the United Kingdom