Is a decompression scuba dive permitted to be planned by a supervisor?

A decompression scuba dive involves specific risks and requires careful planning and management to ensure the safety of divers. The supervision of such dives is typically restricted and subject to approval to minimize the risk of decompression sickness and other complications.

The correct answer reflects the requirement that a diving supervisor can plan a decompression dive only when it is deemed necessary by the Chain of Command (CO) or Officer in Charge (OIC). This hierarchy ensures that the dive's complexity and risks are properly evaluated and that appropriate oversight and measures are in place. This process also underscores the importance of institutional protocols and the necessity for higher authority’s approval before proceeding with such a demanding and potentially hazardous dive.

In contrast, the other choices suggest a more lenient approach towards the planning permission for decompression dives, which can lead to a false sense of security. Planning dives without conditions, assuming only extensive training grants permission, or allowing dives based solely on depth could overlook critical factors like diver experience, dive conditions, and emergency protocols essential for safety. Therefore, the requirement for special approval emphasizes a commitment to safety and adherence to established diving practices.