What should be the first action when a diver appears unresponsive?

When a diver appears unresponsive, the first action should be to assess their responsiveness. This is crucial because it determines the next steps in the response plan. Before taking any further action, such as attempting to revive the diver or administering CPR, it is essential to establish the level of consciousness.

Assessing responsiveness allows you to evaluate if the diver is merely unconscious, if they are in need of immediate medical attention, or if they may be responsive to stimuli. This initial assessment helps to understand the seriousness of the situation and guides the rescuer in determining the most appropriate course of action thereafter, whether it's initiating rescue efforts, calling for help, or performing CPR.

Understanding the diver's condition directly affects the urgency and type of help required, ensuring that the rescuer can implement the appropriate procedures quickly and efficiently.