How many hours must aircrew wait after compressed gas diving before flying?

The correct answer is based on safety protocols established to minimize the risk of decompression sickness, often referred to as "the bends," which can occur when a diver ascends too quickly after being under pressure. After compressed gas diving, it is critical for aircrew to allow sufficient time for nitrogen that has been absorbed into the body while under pressure to be eliminated before ascending to altitudes where the atmospheric pressure is significantly lower, as experienced in flight.

The widely accepted guideline is a minimum waiting period of 24 hours after completing a dive before flying. This recommendation helps ensure that any nitrogen that remains in the body can safely dissipate, thereby reducing the likelihood of experiencing decompression sickness during flight. This precaution is particularly important for individuals flying at high altitudes, where the rapid drop in pressure could exacerbate the potential for medical emergencies related to decompression. Following these guidelines is essential for maintaining the safety and operational readiness of aircrew following diving activities.