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.
Mount Paraw
Paraw cave or Ghar Parau is located in 3050 meter above sea level which is the highest cave in the world and well known as Everest of world caves. this cave has 751 meter depth and with D5 degree of difficulty recognized as one of hardest caves to caving. The British caving team which discovered the cave named their group Ghar Parau foundation. Five professional cavers have lost their lives in this cave.