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  2. Hranice Abyss - Wikipedia

    en.wikipedia.org/wiki/Hranice_Abyss

    Hranice Abyss. Hranice Abyss (Czech: Hranická propast) is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic.The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater.

  3. List of deepest mines - Wikipedia

    en.wikipedia.org/wiki/List_of_deepest_mines

    This list of deepest mines includes operational and non-operational mines that are at least 2,212 m (7,257 ft), which is the depth of Veryovkina Cave, the deepest known natural cave in the world. The depth measurements in this list represent the difference in elevation from the entrance of the mine to the deepest excavated point.

  4. List of deepest caves - Wikipedia

    en.wikipedia.org/wiki/List_of_deepest_caves

    Map all coordinates in "List of deepest caves" using OpenStreetMap. ... World's Longest Caves; References This page was last edited on 19 February 2025 ...

  5. Boesmansgat - Wikipedia

    en.wikipedia.org/wiki/Boesmansgat

    On 24 November 2004, Verna van Schaik set the Guinness Woman's World Record for the deepest dive by diving down to a depth of 221 metres (725 ft). [ 3 ] In October 2022 Karen van den Oever broke her own Guinness World Record [ 4 ] as the world’s deepest diving woman when she descended to 246.65 metres (809.2 ft) using open-circuit equipment.

  6. List of American military installations - Wikipedia

    en.wikipedia.org/wiki/List_of_American_military...

    The U.S. military maintains hundreds of installations, both inside the United States and overseas (with at least 128 military bases located outside of its national territory as of July 2024). [2] According to the U.S. Army, Camp Humphreys in South Korea is the largest overseas base in terms of area. [ 3 ]

  7. Mariana Trench - Wikipedia

    en.wikipedia.org/wiki/Mariana_Trench

    The Mariana Trench is an oceanic trench located in the western Pacific Ocean, about 200 kilometres (124 mi) east of the Mariana Islands; it is the deepest oceanic trench on Earth. It is crescent-shaped and measures about 2,550 km (1,580 mi) in length and 69 km (43 mi) in width.

  8. Deep level underground - Wikipedia

    en.wikipedia.org/wiki/Deep_level_underground

    Although some deep mining took place as early as the late Tudor period (in North-East England, and along the Firth of Forth coast in Scotland) deep shaft mining in Britain began to develop extensively in the late 18th century, with rapid expansion throughout the 19th century and early 20th century when the industry peaked.

  9. Molloy Deep - Wikipedia

    en.wikipedia.org/wiki/Molloy_Deep

    The Molloy Deep is a roughly rectangular, seismically active, [11] extensional, [12] sea-floor basin that lies between the northwestern tip of the Molloy Fracture Zone [13] (a right-lateral, strike-slip fault [14]) and the Spitsbergen Fracture Zone (also a right-lateral, strike-slip fault).