Boybuloq Cave
The cave is the deepest known cave in Asia having been explored to a depth of from the entrance. At the lowest discovered level a water-filled siphon blocks further exploration. It is thought that the cave has the potential to be the deepest known cave in the world, with a theorised depth of making it deeper than the Veryovkina Cave. The explored length of the cave is .
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.