I was diving boats in the slips at my old marina. It was always exciting, especially with the ever present alligators.
I would generally secure power to whatever boat I was diving on, turning off the pedestal. There was an old Catalina 27 that was one of our resident dock queens. I noticed the power cable was hanging down in the water so I pulled on it... the end that was coming from the cockpit did not move.
I pulled it up, and there were the mangled ends of the wires... The breaker on the pedestal was not tripped, and was in the on position
Gotta love it when folks try to cleat off their shore power cables.