What is the world record high altitude scuba diving?
For an altitude depth record, a team of divers made a series of dives researching and exploring a shipwreck in Lake Tahoe in 2002. The divers reached depths of 400 feet at an altitude of 6230 feet using specialized equipment and decompression software as well as 6 different breathing gases. The website is at http://www.diverssupport.com/sstahoe.htm .