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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.
Job Duties. Underwater welders work with a variety of equipment types and procedures. A list of duties all welder-divers should be able to perform includes: 1  Underwater cutting. 2  Underwater photography. 3  Drafting. 4  Inspection and non-destructive testing.