Scuba divers can vomit through their breathing equipment

A scuba diver can throw up through the regulator in their mouth. And if vomiting strikes underwater, keeping that mouthpiece in place helps protect the breath that comes next. Pulling it out to spare the equipment creates a much worse problem: after vomiting, a diver may reflexively inhale. With the regulator removed, that sudden breath can draw in seawater instead of breathing gas. The priority isn't keeping lunch out of the equipment. It's keeping water out of the lungs. That's why diving guidance says to hold the regulator securely in place.

The escape route is through the regulator, not simply around its edges. Material passes through the mouthpiece into the chamber of the second stage, the part held in the mouth, and can leave through its exhaust valve. Liquid passes more easily than solid pieces, which can lodge inside and interfere with performance. There's also a crucial distinction between having breathing equipment available and breathing continuously: the airway briefly closes during vomiting. Keeping the regulator in position means a working gas supply is there when breathing resumes. The body still has to finish its unpleasant business first.

That next breath deserves particular care because debris can remain inside. In a first-person account published by Divers Alert Network, a diver described vomiting through his regulator during a wreck dive, then resisting the urge to immediately exchange it for his spare. He could still breathe cautiously through the primary regulator, and his exhalation displaced much of the trapped material. Once the involuntary reflexes had stopped, he changed regulators and cleared the affected one. The account explains why timing matters: repeated vomiting can turn a hurried equipment swap into an unprotected gasp. A nearby buddy was ready to share breathing gas if needed.

There's another problem competing for attention: staying in place. A diver focused on being sick can lose control of their position in the water. Signaling a buddy and steadying themselves helps prevent an uncontrolled ascent or descent. PADI advises ending the dive with a safe ascent when ready, then stopping diving for the day. If the affected regulator is no longer suitable for breathing, the diver needs their alternate air source. A rush straight upward isn't the answer. The task is to maintain access to breathing gas and return safely, with help rather than a scramble.

The better outcome starts before descent. Seasickness and an upset stomach don't automatically disappear beneath the surface; Divers Alert Network advises against descending while nausea persists. Discomfort can also steal the attention needed to monitor the dive. After an underwater vomiting episode, the equipment needs attention too: trapped material must be removed, and any doubts about regulator performance call for a qualified technician. Rental staff need to know what happened so they can clean and inspect it. It's an awkward conversation, but a useful one. This is life-support equipment that has just handled something very different from its usual workload.