So what happens to the diver, who gets his reg pulled out of his mouth? Does the body immediately shut the airways? What if you are breathing in at the moment it happens?I have been told by multiple people who witnessed or were involved in an actual oog situation that the oog diver will almost always go for the reg in your mouth. And they will do it very fast and with a lot of power. Exhale fully and hold your breath, then see how long it takes before the whole breath holding thing becomes impossible.