We have a waterproof pouch that we wear around out necks. Since I use a wet suit (I get cold if it's below 90), I always have it zipped inside. My husband usually wraps the strap around his neck and under his arm, so the only way it would drop to the bottom would be if someone cut it off of him. The crews on the dive boats watch out for you as well. I've left my camera, watch, etc., on board and never had a problem.
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