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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 or offshore welders combine commercial diving qualifications with welding skills normally performed on dry land. Underwater welders must be able to handle bulky equipment specially designed for this job while working in a hazardous environment.