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Yep, exactly that in Cozumel. I saw him "helping" others before me, so knew it was a possibility. He turned it off as I stood up. I just turned it back on before splashing. (I've made it a priority for a long time to be able to reach my own valve.)If anyone has an experience of such people who do the same thing everyday and yet still manage to set someone up for death, do share.
It happens a fair amount when you have a sidemount diver diving single tank on a recreational boat.On some boat dives, the regular DMs are always tasked to check that everybody's tanks have indeed been turned on. They do this everyday. If anyone has an experience of such people who do the same thing everyday and yet still manage to set someone up for death, do share.
A guy closed mine and did enough of a turn so that the needle wouldn’t move when breathing but started being more difficult to breathe at around 25m.I had one guy once check my air valve and actually shut it off thinking he was turning it on. I had another person years later that attempted to do the same thing on a group shore dive but this time it was not asked for, and when I felt someone messing with my tank valve I spun around and asked them what the hell were they doing?!!