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.
John Volanthen
In 2004, Volanthen and Stanton set a world record for the greatest depth achieved in a British cave, cave diving at Wookey Hole in Somerset.
In 2010, Volanthen, Stanton, Jason Mallinson, and René Houben set a world record for the longest cave penetration dive, reaching in the Pozo Azul cave system in the Rudrón Valley in Spain.