I love these threads when everyone agrees that nobody knows anything, so we shouldn't speculate... Then we all go on to speculate. I suspect he was fluke-smacked by a whale btw. They have those things there.
Age in now the leading causative factor in recreational diving fatalities... Not because the diver is old, but because the diver has the "health" of an aging person. A perfect reality check is to climb on to a treadmill or elliptical that has a heart rate monitor. I can remember not very long ago that my target heart rate was 180 bpm for a good workout. Now the machine sets it at 112. I lie to a machine about my age so I can get a better workout. I assume this keeps dropping until it's about 12 bpm, then you die.
I'm 63 btw.
suspect he was fluke-smacked by a whale btw. They have those things there. Yes, I suspect it was while working out at over 112 bpm.