Diving Committee of the Undersea and Hyperbaric Medical Society reviewed the procedures for rescuing a submerged unresponsive compressed-gas diver and published their recommendations in 2012. When an unresponsive diver is found the rescuer should assess the security of the airway by checking if the mouthpiece or full-face mask is in place. If the mouthpiece is in place, it should be retained in position. If not, it should be replaced if the divers are in an overhead environment and the casualty cannot be surfaced without delay. If the airway appears secure and the diver is convulsing, the rescuer should wait until the convulsions subside before surfacing the casualty. The rescuer must decide whether their own ascent would be unacceptably hazardous. If they decide they cannot surface immediately, they should make the casualty buoyant and let them float to the surface, where there may be some chance of rescue. If the rescuer decides they can surface without excessive risk, they should keep the casualty's head in a neutral position and surface the casualty in the way that is recommended by their training agency. once surfaced the rescuer should ensure that the casualty is buoyant and face-up. If immediate assisted removal from the water is possible, this should be done, and cardiopulmonary resuscitation (CPR) started if indicated. If immediate removal from the water is not possible, the rescuer should give two rescue breaths, then assess whether surface assistance is less than 5 minutes away. If surface assistance is within 5 minutes, either by waiting or by towing, the casualty should be towed or given further rescue breaths while waiting. If surface support is more than 5 minutes away, the rescuer should give rescue breaths foe about a minute, and the tow the casualty without further rescue breaths to the nearest surface support. The casualty should then be removed from the water and given CPR if indicated. 2019 NATO simplified protocol The Medical Panel of the NATO Underwater Diving Working Group (UDWG) examined the procedure for management of a convulsing diver using a half-mask and separate mouthpiece at depth. They considered that the guidance for this very rare situation should be simple, clear, and easy to follow. They concluded that the available evidence to support delaying surfacing until the clonic phase of oxygen toxicity convulsions dissipated was insufficient, that the probability of complete airway obstruction during a seizure was low, and that the survivability