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.
Krubera Cave
The biocenosis of Krubera-Voronja is composed of more than 12 species of arthropods of several groups, such as pseudoscorpions, spiders, opiliones, crustaceans, springtails, beetles and dipterans. Krubera-Voronja cave is inhabited by endemic species, including four springtails discovered during the CAVEX Team expedition of 2010: "Anurida stereoodorata", "Deuteraphorura kruberaensis", " Schaefferia profundissima", and "Plutomurus ortobalaganensis"; the last of these is the deepest terrestrial animal ever found on Earth, living below the cave entrance. The beetle "Catops cavicis" inhabits Krubera-Voronja cave and also several caves around the Ortobalagan valley. The subterranean amphipod crustacean "Kruberia abchasica" caught by Gennady Samokhin in August 2013, during dives in the siphon 'Dva Kapitana', dwells at the deepest part of the Krubera Cave (at the depth of -2,175 metres).