A diving colleague of mine spent over half an hour inverted after a bit of an incident involving a lost weight belt and having to reel himself up to the surface.
Once when jumping over a fence I got my shoelace caught on the top of the fence and got stuck in an upside down position for approximately 30 minutes until someone noticed me hanging there. I tried the whole time to get my shoe off but was not successful.
A diving colleague of mine spent over half an hour inverted after a bit of an incident involving a lost weight belt and having to reel himself up to the surface.