What is the recommended action if the surface interval is more than 5 minutes but less than 7 minutes for surD?

Increasing the time on oxygen at 50 FSW (feet of seawater) from 15 to 30 minutes is the recommended action when the surface interval is more than 5 minutes but less than 7 minutes for surD. This recommendation is based on the safety protocols designed to handle specific situations encountered during underwater operations, such as potential decompression issues.

When dealing with a relatively short surface interval of more than 5 minutes but less than 7 minutes, it is crucial to ensure that divers are receiving adequate oxygen enrichment to help mitigate the risks associated with inert gas saturation. The increase in oxygen duration at 50 FSW provides a longer time for off-gassing and helps reduce the likelihood of decompression sickness, ensuring a safer return to depth.

This adjustment is significant because it aligns with the physiological needs of the diver, considering the conditions they have just experienced. By following prescribed protocols in this manner, divers can enhance their safety margins, thus effectively managing potential risks associated with their dive profile.