What should a diver do if they experience an emergency situation underwater?

When a diver encounters an emergency situation underwater, the best course of action is to follow the emergency procedures outlined in their diving plan. This is crucial because the diving plan is designed to prepare divers for potential hazards, ensuring they have clear protocols to manage emergencies effectively. These procedures may include steps for controlled ascent, signaling for help, or using emergency equipment like a spare air supply.

Adhering to the pre-established plan helps maintain composure and provides a structured response to the emergency, which is essential in potentially stressful conditions. It also allows the diver to assess the situation methodically rather than acting on impulse or fear, which can exacerbate the situation. In any diving emergency, safety should be the priority, and having a clear plan enhances the diver's ability to manage risks effectively.