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I've read and heard from multiple places that the size of the diaphragm in the 2nd stage is a big part of its performance. I was wondering if anyone could explain it fully with some kind of numbers involved with it. I hear that the diaphragm is more responsive, that a larger diaphragm means less...

I was wondering if there were techniques or equipment that would facilitate marking a wreck or point of interest underwater and then retrieving everything on the surface after the dive. It's not something I do every week, but at least a dozen times a year I'll find or see something that I'd...