What is the immediate action to take if a diver experiences a convulsion?

When a diver experiences a convulsion, the most immediate action is to steady the diver while waiting for assistance. This is crucial for several reasons. First, during a convulsion, there is a significant risk of injury if the diver is allowed to thrash around uncontrollably. Steadying the diver helps prevent them from hitting their head or losing control of their buoyancy, which could lead to further complications, such as injury or drowning.

Additionally, it’s important to assess and monitor the diver’s condition while waiting for professional help. Once the diver is steadied, a supervisor or another trained individual can check for the diver's breathing, heart rate, and overall responsiveness. This action promotes safety by ensuring that the diver remains as stable as possible until medical assistance can arrive or the diver recovers from the convulsion.

The other options, such as removing the mask or decompressing rapidly, can introduce additional risks. For instance, removing the mask could lead to water entering the diver's lungs or impede their ability to breathe. Decompressing at a fast rate could cause barotrauma or the bends, which are serious medical conditions. Resuming oxygen breathing at the current depth without professional assistance is also hazardous because it does not address the immediate safety