I'm familiar with one case, not much of a mystery. Occasionally humans push their luck too far. It had nothing to do with diving.
RIP
I just gave you some info, I knew him. A public messageboard is not the place to discuss it. I'm now out of this thread.
Then you should have kept quiet.
Why do the crowd expect to get details laid out on a public forum? Close this thread before it gets out of control.