What should a diver do in an out-of-air emergency?

In an out-of-air emergency, performing an emergency ascent and using an alternate air source is the most effective response. This approach addresses the immediate need for air while ensuring the diver's safety during the ascent.

Utilizing an alternate air source typically means accessing a partner's spare regulator or deploying other emergency air supplies, which can quickly stabilize the situation. It is crucial for divers to remain calm, signal their buddy or dive team effectively during this process, and ascend at a controlled rate to avoid further complications, such as decompression sickness.

This method highlights the importance of partner awareness in diving and the necessity to have a plan for emergencies. It is also a reminder of why divers should always dive with a buddy and ensure their equipment is functioning properly before entering the water to minimize the risk of air supply issues.