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Saturation diver working on the USS Monitor wreck at 70 m (230 ft) depth Saturation diver conducting deep-sea salvage operations. Saturation diving is diving for periods long enough to bring all tissues into equilibrium with the partial pressures of the inert components of the breathing gas used.
Tens of thousands of recreational divers are trained each year and the overwhelming majority of these divers are taught the "over 40% rule". [ 11 ] [ 3 ] [ 38 ] Most nitrox fill stations which supply pre-mixed nitrox will fill cylinders with mixtures below 40% without certification of cleanliness for oxygen service. [ 3 ]
The procedures vary depending on whether the diver is using scuba or surface supplied equipment. Scuba divers control their own descent and ascent rate, while surface supplied divers may control their own ascents and descents, or be lowered and lifted by the surface team, either by their umbilical, or on a diving stage, or in a diving bell.
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