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.
Moncodeno
The most notable of these are the Alto Releccio, with a depth of , making it one of the deepest caves in Italy, as well as the "Icebox of Moncodeno", a cave, visited by Leonardo da Vinci that stays icy even in summer.