If a diver convulses underwater, what should be your first priority?

In the case of a diver convulsing underwater, the first priority should be to get the diver to the surface. This is crucial because a convulsion can impair the diver's ability to swim and may lead to loss of consciousness, increasing the risk of drowning. Ensuring that the diver reaches the surface where they can breathe safely is vital for their immediate survival.

Once the diver is at the surface, you can then provide further assistance, such as calling for emergency help or administering oxygen if trained to do so. It’s important to remember that time is critical in emergency situations, and getting the diver to a safe breathing environment should come first.