If the console operator detects air being mixed with O2 during decompression, what is the first step?

The correct approach when air is detected being mixed with O2 during decompression involves notifying the dive supervisor. This is crucial because the situation could pose significant safety risks for divers, and the supervisor has the authority and responsibility to make critical decisions regarding the safety and operational protocols for the dive team.

The dive supervisor may need to assess the situation, potentially halt the current operation, and address any risks associated with returning divers to the surface. By prioritizing communication, the dive team can ensure that all necessary measures are taken to address the situation effectively, including deciding if an emergency ascent or any other immediate action is warranted.

The choice to align the ORCA properly, while it may be an important task during normal operations, is not the most immediate concern in a situation that involves a potentially hazardous gas mixture. Ceasing all underwater activities might not be necessary until further assessment is made, and an emergency ascent could be premature without a full understanding of the implications and risks involved.