Which of the following is NOT a situation where decompression can be omitted?

In this context, the situation that is NOT an instance where decompression can be omitted is related to unexpected encounters with marine life. Decompression is a crucial safety procedure designed to prevent decompression sickness, commonly known as "the bends." This condition arises due to the formation of nitrogen bubbles in the body when divers ascend too quickly from depths beyond certain pressure thresholds.

Uncontrolled ascents, going over dive time at depth, and real emergencies requiring immediate ascent all typically involve scenarios where a diver may be forced to ascend rapidly without proper decompression. Each of these situations poses significant risks, and emergency protocols might necessitate skipping decompression.

Unexpected encounters with marine life, however, while potentially troublesome or alarming, do not justify an immediate ascent that would compromise safety. Therefore, divers should follow decompression protocols regardless of unexpected marine interactions, as maintaining safety remains a priority even under distressing circumstances. This reinforces that decompression practices are designed to safeguard divers primarily against physiological risks associated with rapid ascents, not just routine dive considerations.