How long should a passenger wait to fly after diving if the dive required a controlled ascent?

The recommended wait time for a passenger to fly after diving, particularly following a dive that required a controlled ascent, is indeed 24 hours. This guideline is based on the need to allow sufficient time for any potential nitrogen bubbles that may have formed in the body during the dive to dissipate fully.

When a diver ascends, nitrogen absorbed into the body at depth can expand and potentially form bubbles as pressure decreases. If a diver flies before adequate time has passed, the change in altitude and pressure in an aircraft could exacerbate bubble formation, leading to decompression sickness, which can be a serious and sometimes life-threatening condition.

Waiting 24 hours provides a safety buffer to minimize this risk and ensures that the body has adequately eliminated the nitrogen absorbed during diving. This recommendation aligns with guidelines from diving and aviation safety organizations, which help to standardize practices for the well-being of passengers who participate in both activities.