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Altitude diving

SCUBA Diver in the mountain lake Lai da Marmorera 1,680 metres (5,510 ft) above sea level)

Altitude diving is underwater diving using scuba or surface supplied diving equipment where the surface is 300 metres (980 ft) or more above sea level (for example, a mountain lake).[1][2] Altitude is significant in diving because it affects the decompression requirement for a dive, so that the stop depths and decompression times used for dives at altitude are different from those used for the same dive profile at sea level.[3] The U.S. Navy tables recommend that no alteration be made for dives at altitudes lower than 91 metres (299 ft) and for dives between 91 and 300 meters correction is required for dives deeper than 44 metres (144 ft) of sea water.[4] Most recently manufactured decompression computers can automatically compensate for altitude.

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