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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.
Activities include underwater diving, sailing, sea rescue operations, surfing, river rafting, whitewater kayaking and in some circumstances, endurance swimming. 1  Scuba divers in steamer wetsuits, one wearing a hood. 2  One-piece suit worn by kitesurfer. 3  High visibility suit for sea rescue. 4  Surfers in steamer wetsuits.