Years ago, my buddy and I were doing some work at a local dive site and needed to move a pretty substantial piece of metal.
I rigged a pretty big trash can for lift and tied it off with parachute cord. When we were done, the trash can was so buoyant, we couldn't tip it to deflate it. I ended up cutting the rigging and it rocketed to the surface, striking rock before it surfaced. It was the loudest BOOM I've ever heard underwater. There's video, but it doesn't do the experience justice.
That boom was super disconcerting to me, as I knew I was just below it.
I rigged a pretty big trash can for lift and tied it off with parachute cord. When we were done, the trash can was so buoyant, we couldn't tip it to deflate it. I ended up cutting the rigging and it rocketed to the surface, striking rock before it surfaced. It was the loudest BOOM I've ever heard underwater. There's video, but it doesn't do the experience justice.
That boom was super disconcerting to me, as I knew I was just below it.