If you observe signs of panic in a diver underwater, what is the first action you should take?

The first action to take when observing signs of panic in a diver underwater is to locate your alternate air source in case it is needed. This approach ensures that you are prepared for the possibility that the distressed diver may need assistance with air supply or may require emergency support if their condition worsens. Having your alternate air source readily available allows you to react swiftly without having to fumble or search for it later, which is crucial in a potentially stressful situation where time and clarity can significantly impact safety.

While calming the diver verbally is an essential step in managing their anxiety and situation, it may not be effective if you are not adequately prepared to respond to an emergency. Ascending towards the surface or signaling for other divers to assist may be necessary later, depending on the diver's condition, but ensuring that you have your equipment ready is a proactive measure that lays the foundation for a safer resolution of the panic situation.