Lenght: 317.5 km. Deepness: 127 meters.
Diving in the caves is considered one of the most popular and spectacular extreme entertainment, and one of the best spots for this is Sac Actun Cave. Their general length is about 317.5 km, of which only 6 km of galleries are 'dry'. All other tunnels are more or less flooded. The depth of some pits surpasses 127 meters. The research of the cave was started in 1987. The scientists regularly discover the new junctions connecting the complex of the underground vaults with other large caves nearby.
At present, Sac Actun is the second-longest cave in the world and is only the mammoth cave. The divers like the complicated cave system thanks to the comfortable conditions for diving. The entrances to the cave are all along the coast, and the water temperature in the flooded tunnels seldom drops below 20 degrees. The main danger to the divers is the complicated cave structure. So far, researchers have discovered more than 5,000 transitions, which can be very fast.
Next - Holloch
Lechuguilla Cave, USA
Holloch, Switzerland
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