First dive trip after certification. Was diving the Sherman, an old steamer sunk sometime around the 1880's lying 10 miles off shore of Little River, SC in 50 feet of water. I was in the process of shopping for my own equipment but only had my own mask, fins, and boots at the time so had to rent everything else from the Dive Op. Everything fit okay except I had trouble finding a weight belt that was long enough. Finally found an old one that would reach around me but it was actually much too long. I had no other choice but to use it.
Second dive of the day, I had been on the bottom for around 20 minutes, fanning the sand around the wreck looking for artifacts. Suddenly, I felt the weight belt slipping off my waist. Somehow, it had come unbuckled. I don't know if I had not gotten it locked in properly, it had accidentally caught on something, or the buckle was just too worn to lock in properly. All I do know is that as the last bit of it slipped off my waist, I was able to grab the end of it and I found myself hanging fins straight up towards the surface with the rest of me wanting to follow and me hyperventilating like crazy. After a few seconds, I was able to calm myself and get my breathing under control. I got the weight belt back around me, but due to it being so long, every time I started trying to get it back into the buckle, the weights would drop from my waist and my feet would start upward again. I looked around and naturally, my insta-buddy was nowhere to be found and there were no other divers in sight. The only thing I could do was hold the belt around my waist with both hands and go to the surface. I was not able to see the console computer I was using so the only thing I could do was ascend slowing by watching my smallest bubbles. I came up about 20 yards in front of the boat and had to swim to it. When I got to the boat I was able to hand the weight belt to the captain to free my hands.
Fortunately, I suffered no ill effects from the adventure. Just a crash course in emergency management, I suppose.