Abismo Guy Collet
The Abismo Guy Collet (SP-090) is the deepest cave in South America, and the deepest in the world that is formed in quartzite. Located in a tepui in northern Brazil near the border with Venezuela, this cave was first explored by cavers in 2006 to a depth of 671 meters.
Jaskinia Niedźwiedzia
Jaskinia Niedźwiedzia (pronounced Yaskeenya Niecwiedza and translated as Bear Cave) - is the longest cave in Śnieżnik Mountains part of Sudety mountains discovered in 1966, located near village Kletno in Poland. Famous from many excavations of the cave bear (Ursus spelaeus).