If a diver using enriched air convulses underwater, is it correct to attempt to give them regular air from a pony bottle?

Attempting to give a diver who is convulsing underwater regular air from a pony bottle is not recommended for several reasons centered around safety and effectiveness. In situations where a diver is experiencing convulsions, there can be significant risks involved, including the potential for aspiration of water, which can occur if a diver is not able to manage their airway.

Administering regular air while underwater does not address the underlying issues that may have caused the convulsions, such as oxygen toxicity or other physiological effects related to enriched air diving. In such cases, the priority should be to safely and swiftly bring the diver to the surface, where they can receive appropriate medical assistance and have their breathing managed in a safe environment.

Additionally, the diver's convulsions may impair their ability to hold onto the pony bottle or utilize it effectively, leading to further complications. Therefore, focusing on recovery efforts, such as surfacing and administering first aid, is far more essential than attempting to provide regular air in the water.