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.
List of deepest caves
This list of deepest caves includes the deepest known natural caves according to maximum surveyed depth. The depth value is measured from the highest entrance to the lowest accessible point.