What should be done once the O2 loss is corrected at 30'?

When the oxygen loss is corrected at a depth of 30 feet, resuming at the point of interest (POI) is the appropriate course of action. After addressing the issue with oxygen supply and ensuring the diver's safety, it is crucial to continue the diving operation to achieve the initial goals of the dive. The equipment and the diver's well-being would have been verified, allowing them to safely continue their exploration or work at the intended site.

This approach maintains continuity of the dive plan and allows for the completion of tasks that may have been interrupted. The focus is on ensuring that the diver has the necessary resources to operate effectively while adhering to safety protocols.