What is the appropriate action for treating an "asymptomatic" diver who has omitted decompression for less than 1 minute?

The appropriate action for treating an "asymptomatic" diver who has omitted decompression for less than 1 minute is to return to the depth of the last stop and increase the stop time by 1 minute. This approach is based on the understanding of decompression principles and the physiology of diving.

When a diver fails to complete the required decompression stops, there is a potential risk of nitrogen bubbles forming in the body, even if the diver is currently asymptomatic. By returning to the last decompression stop and adding time, you allow the body to off-gas nitrogen more effectively and minimize the risk of decompression sickness.

This method is particularly important when the omission is relatively short (in this case, less than 1 minute), as it allows for a correction without unnecessarily exposing the diver to high-risk situations or lengthy decompression procedures. In contrast to other options, this step prioritizes safety while addressing the missed decompression in a controlled and measured way.