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Decompression Sickness is caused by the absorption and release of inhaled gases under differing Pressure environments and changes of pressure. At Altitude , Atmospheric pressure is lower than at Sea level, so surfacing at the end of an altitude dive leads to a greater reduction in pressure and so more risk of decompression sickness.

Normally Dive Computer s detect changes in altitude and automatically adjust their calculation of a safe decompression regime for a dive at that altitude. If an altitude-aware computer is not used, altitude-aware Decompression Tables must be used.