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I have never seen it, but have read that once in a blue moon the diver turns air on and the DM checking it turns it off. I assume this has happened simply because of the number of divers and DMs worldwide. On a tropical vacation it was just me and the DM. He jumped in with an empty tank and used my octo at depth for our ascent. And IMO he was a fine DM from whom I learned a lot, as I was almost one then myself. So anyone can make a mistake if they do something enough times. I don't like anyone touching my stuff. On another charter, the DM was doing the tank switches and I just figured OK, let him do his thing. He tightened my BC tank lock tighter than the instructions advise. Since, I have found it doesn't work quite as well and I've actually had a tank slip off and another slip down. Those tank locks are a hundred bucks. Having said that, I good solution to the air check thing may be for the DM to observe the diver breathing from the reg. a few times and checking the SPG, as we are all taught to do. This would be just before the diver jumps off the boat. No valve on/off mistakes. We are taught as divers AND as DMs that a certified diver is responsible for himself and his own equipment. But that may be in an ideal world and one that doen't contain lawsuits for everything. I have forgotten to turn on air a couple of times over the years, fortunately on shore dives. Perhaps I'm just a little more slack with that than when I'm jumping off a boat.