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.
Velebit caves
The vertical shaft "Patkov Gušt", named after a deceased Croatian speleologist is 553 meters deep and the second deepest pitch in the world .