In which condition should a pilot avoid flying immediately after a scuba dive?

The correct condition where a pilot should avoid flying immediately after a scuba dive is following a non-controlled ascent. This is due to the risk of decompression sickness (DCS), which can occur when a diver ascends improperly or too quickly from a dive.

During a scuba dive, divers must follow specific ascent protocols to ensure that nitrogen absorbed in their body tissues is safely eliminated. A non-controlled ascent, where a diver might ascend too quickly without stopping at various safety stops, significantly increases the risk of nitrogen bubbles forming in the bloodstream. If a pilot flies soon after this type of ascent, these nitrogen bubbles could expand due to the decrease in atmospheric pressure at higher altitudes, potentially leading to serious health issues like DCS.

In contrast, controlled ascents involve following air-speed limits and making necessary stops, thereby minimizing the risk of DCS and making it safer for a pilot to fly after a dive. High humidity, low visibility, or controlled ascent may pose challenges but do not carry the same direct risk associated with flying shortly after a poor ascent from a dive.