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Underwater diving is the practice of descending below the water's surface to conduct underwater activities. In ambient pressure diving, the diver is exposed to the pressure of the surrounding water, and uses breathing apparatus for scuba diving or surface supplied diving, or when freediving, will breath-hold. The saturation diving technique reduces the risk of decompression sickness after long duration deep dives.
âThe Man Who Doesnât Breatheâ: World-record diver can hold his breath underwater for 22 MINUTES. 1  Stig Severinsen is the holder of multiple records in diving using his 'State of Zen' technique to control his breathing. 2  Also swam 500ft underwater in 2mins and 11secs. 3  Mr Severinsen, 41 from Aalborg, began free diving in 2003.