Pro tip: Watch how an old hand ties off a bag line before you open your mouth
I was working a bridge job near Mobile Bay a few years back, fresh off my surface tender card. This older diver named Ray must have been 60, grey beard, hands like catcher's mitts. He was showing me how to tie off a lift bag to a 400-pound beam, and I started telling him about a knot I learned in class. He just looked at me, cut me off, and said "Son, that knot will spill at 30 feet with any sideways current." Then he tied his own in about 4 seconds and it held through the whole lift. I felt about two inches tall, but he didn't rub it in. He just handed me a piece of line and made me practice it six times until I could do it blindfolded. Anyone else have a diver take the time to correct you without making you feel dumb?