How long should a pilot wait after a non-controlled ascent from a scuba dive before flying?

The appropriate waiting period after a non-controlled ascent from a scuba dive before flying is typically recommended to be 12 hours. This guideline helps to prevent decompression sickness, which can occur when a diver ascends too quickly or does not allow enough time for nitrogen to be eliminated from the body before exposing themselves to the reduced pressure of flying.

The risk is particularly relevant for divers who experience rapid ascents as it can lead to bubbles forming in the bloodstream, which can be exacerbated by the lower atmospheric pressure encountered during flight. By observing a wait of 12 hours, the body has adequate time to off-gas the nitrogen absorbed during the dive, thereby significantly reducing the risks associated with flying shortly after diving.

In contrast, longer waiting periods, such as 24 hours, are often advised after deeper or more involved dives, but for a non-controlled ascent, the 12-hour guideline is generally deemed sufficient while considering general safe diving practices.