What is the required action if a diver is shifted back to air due to oxygen supply loss, and the issue is quickly resolved?

In the scenario where a diver is shifted back to air due to a loss of oxygen supply, and the issue is quickly resolved, the appropriate action is to resume the oxygen schedule immediately. This decision is grounded in the understanding of the physiological effects of breathing oxygen at depth, particularly in relation to avoiding decompression sickness and managing nitrogen levels in the body.

When a diver is utilizing pure oxygen, it effectively reduces the amount of nitrogen in the bloodstream, which is crucial for preventing the formation of bubbles during ascent. The interruption of oxygen would momentarily introduce a risk factor, but promptly resuming the oxygen supply ensures that the diver can continue to efficiently eliminate nitrogen from their system. Reverting to a pure oxygen mix immediately after the problem is fixed supports the diver's safety and helps maintain the intended decompression schedule.

Continuing with surface decompression, ascending to the surface, or waiting 10 minutes before reinstating oxygen would not be appropriate actions as they could increase the risk of decompression sickness by allowing more nitrogen to remain in solution in the tissues.