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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.
Underwater welding is quite safe now with the advancement in technology. Welders enter decompression chambers to undo the effects of deep sea diving and nitrogen which enters the blood stream. Underwater welders do not die everyday, roughly 10 per year are killed in accidents.