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  2. Cave survey - Wikipedia

    en.wikipedia.org/wiki/Cave_survey

    A cave survey is a map of all or part of a cave system, which may be produced to meet differing standards of accuracy depending on the cave conditions and equipment available underground. Cave surveying and cartography, i.e. the creation of an accurate, detailed map, is one of the most common technical activities undertaken within a cave and is ...

  3. SubTropolis - Wikipedia

    en.wikipedia.org/wiki/SubTropolis

    The interior of SubTropolis. SubTropolis is a business complex located inside of a 55,000,000-square-foot (5,100,000 m 2), 1,260-acre (5.1 km 2) mine in the bluffs north of the Missouri River in Kansas City, Missouri, United States.

  4. List of deepest caves - Wikipedia

    en.wikipedia.org/wiki/List_of_deepest_caves

    Jojar Cave 1300 [46] 2.2 km (1.4 mi) Iran ... Map all coordinates in "List of deepest caves" using OpenStreetMap. Download coordinates as: KML; GPX (all coordinates)

  5. Underground Tours That You Didn't Know Were Right Under ... - AOL

    www.aol.com/underground-tours-didnt-know-were...

    From one-of-a-kind caves to commuter walkways to “underground cities” from the early 1900s, there are many places to find adventure below ground. Some of these are free to explore, while other ...

  6. List of caves in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_caves_in_the...

    Arnold Lava Tube System; Boyd Cave; Derrick Cave; Fort Rock Cave; Horse Lava Tube System; Lava River Cave; Oregon Caves National Monument; Paisley Caves; Redmond Caves;

  7. Subterranea (geography) - Wikipedia

    en.wikipedia.org/wiki/Subterranea_(geography)

    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

  8. Devils Hole - Wikipedia

    en.wikipedia.org/wiki/Devils_Hole

    Diagram of Devils Hole Cave (1988) Located 650 feet (200 m) north of Devils Hole is a separate cave system called Devils Hole Cave (#2). It was first explored underwater to a depth of 70 feet (21 m) by divers from the Southwestern Speleological Society in February 1961.

  9. List of longest caves - Wikipedia

    en.wikipedia.org/wiki/List_of_longest_caves

    Caves are found around the world. The largest form in areas of karst landforms whose rocks dissolve easily. Preferable conditions for karst cave formation are adequate precipitation, enough plants and animals to produce ample carbon dioxide, and a landscape of gentle hills which drains slowly.