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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.
Deep breathhold or scuba dives by individuals for the sake of records produce little if any scientific information that benefits diving. Offshore, inland and coastal commercial divers now work in conventional surface air supplied helmet gear to depths of 180 to 200 feet. Scuba diving is permitted by OSHA regulations to those depths under limited conditions.