What is the primary concern if a diver has a convulsion underwater?

The primary concern when a diver experiences a convulsion underwater is to get the diver to the surface to prevent drowning. This is critical because a convulsion can lead to a loss of motor control and consciousness, significantly increasing the risk of drowning. In this state, the diver may not be able to manage their breathing or maintain their buoyancy, leading to a dangerous situation.

Once the diver is safely at the surface, additional actions can be taken, such as providing assistance and first aid, monitoring their condition, and ensuring they are breathing properly. Addressing the immediate safety of the diver takes precedence over other considerations, such as gear integrity or documentation, which are less important in the urgent situation of managing a convulsive episode. Determining the cause of the convulsion is also essential but can only be addressed once the diver is secure and no longer at risk of drowning.