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TropicalDiver:You know, this is really interesting. In Cozumel, my friend almost drowned (5th dive) by getting a regulator (RENTAL set) from a smaller dive shop there that gave her a mix of air and saltwater suddenly at 60'. She paniced and took the reg out of her mouth at 60'. The DM shoved it back in two times on the way up to the surface. At the surface, her lips were blue but she was still conscious. She had inhaled a lot of saltwater. Overnight at the hospital and she was OK. Here's the scary part - diving two days later...my other girlfriend got the exact same reg set - and it also failed on her. She didn't panic, just swallowed the water and ascended. Second scary part, neither of them ever thought to reach for their seconds. The DM that day, just briefly took the basic parts apart and declared it functioning while on the boat. THAT ended our going with that dive op ever again!
Snowbear:You can do this without unplugging your inflator and I agree it is good to practice...