Web Monkey:If you want to make them safer, learn tri-mix, take a deep diving class and a deco diving class, get a set of doubles, a buddy that stays with you and will actually watch out for you and practice with him in shallower water until you 're certain you can handle anything that happens.
At 160' on air, your uncle is guaranteed to be narced out of his mind. I don't know what kind of things he's doing down there, but watching out for you isn't one of them.
Ordinarily you couldn't get more than half the people on this board to agree that fire is hot. Having virtually everybody say that your uncle is going to get you killed should be telling you something.
Terry
You are aware you are responding to a 15yo. What agency in their right mind would certify him for trimix? Why even bring that up?