Krubera Cave
The difference in elevation of the cave's entrance and its deepest explored point is . It became the deepest-known cave in the world in 2001 when the expedition of the Ukrainian Speleological Association reached a depth of which exceeded the depth of the previous deepest-known cave, Lamprechtsofen, in the Austrian Alps, by . In 2004, for the first time in the history of speleology, the Ukrainian Speleological Association expedition reached a depth greater than , and explored the cave to . Ukrainian diver Gennadiy Samokhin extended the cave by diving in the terminal sump to 46 metres' depth in 2007 and then to 52 m in 2012, setting successive world records of 2,191 m and 2,197 m, respectively. Krubera is one of the two known caves on Earth deeper than 2,000 metres.
Kinderle Cave
The entrance to the cave is located at an altitude of 94 m and is connected to an inclined tunnel. In the tunnel is a glacier measuring 720 square m and a thickness of 8 m. Various stalagmites grow on the glacier. The length of the cave is 8130 m, including 230 m under water. The volume of the cave is 229600 cubic meters, the floor area is 39400 square meters. The average width of the pass is 5.4 m, the height is 7.1 m. The amplitude of the corridors is 215 m, this is the deepest cave in the Urals. Around the cave grows cannabis, so the Bashkirs called the cave Kinderle. They kept meat on the glacier in the summer.