What's the deepest cave?
Krubera Cave
The difference in elevation of the cave's entrance and its deepest explored point is 2,197±20 metres (7,208±66ft). It became the deepest-known cave in the world in 2001 when the expedition of the Ukrainian Speleological Association reached a depth of 1,710m (5,610ft) which exceeded the depth of the previous deepest-known cave, Lamprechtsofen, in the Austrian Alps, by 80 metres (260ft). In 2004, for the first time in the history of speleology, the Ukrainian Speleological Association expedition reached a depth greater than 2,000 metres (6,600ft), and explored the cave to −2,080m (−6,824ft). Ukrainian diver Gennadiy Samokhin extended the cave by diving in the terminal sump to 46 metres' depth in 2007 and then to 52m in 2012, setting successive world records of 2,191m and 2,197m, respectively.[3][4] Krubera is one of the two known caves on Earth deeper than 2,000 metres.