Seems to me his lack of proper qualifications should have been easily caught in the screening process (but maybe I don't really understand how things are done in that field). I'd echo what the others said, this is not confined to diving. I work in software development, the thing you should be able to learn on the internet! ; ) And even here, experience brings you things that you can't learn by reading on the net.
I'll say one thing in defense of the net and self-learning though, if your mentors sucks, it'll give you a shot at realizing it, instead of losing years working with idiots.
I'll say one thing in defense of the net and self-learning though, if your mentors sucks, it'll give you a shot at realizing it, instead of losing years working with idiots.