Based on the information available, I believe:
The cause of the mishap was a heart attack. Whether that could have been foreseen - heart attacks often cannot - we don't know.
Buddy team integrity was lost. The mishap diver was solo when he had his debilitating event. Whether or not prompt rescue could have avoided death we don't know; what we do know is that if buddy team integrity had been maintained then prompt rescue would have at least been possible.
Gas management was poor to non-existent. This exacerbated the late rescue problem as the "buddy" didn't have enough reserve to bring the mishap diver up when he did find him.
If there was a good plan it wasn't followed... my bet is that there was no good plan at all to follow in the first place.
I fear that this dive profile may be far more typical of recreational diving today than any of us would like to admit; that many recreational divers already have most of the links in the accident chain already forged and joined when they hit the water, and the margin for error is shaved to the point where an event that would be no more than a "glitch" in a well planned and executed dive ends up being the final link to a mishap. In this particular incident (heart attack) having a good plan and a prompt rescue may not have saved him, but the existing plan and execution of the dive made his post heart attack demise near certainty.
Plan the dive; dive the plan.
Rick
The cause of the mishap was a heart attack. Whether that could have been foreseen - heart attacks often cannot - we don't know.
Buddy team integrity was lost. The mishap diver was solo when he had his debilitating event. Whether or not prompt rescue could have avoided death we don't know; what we do know is that if buddy team integrity had been maintained then prompt rescue would have at least been possible.
Gas management was poor to non-existent. This exacerbated the late rescue problem as the "buddy" didn't have enough reserve to bring the mishap diver up when he did find him.
If there was a good plan it wasn't followed... my bet is that there was no good plan at all to follow in the first place.
I fear that this dive profile may be far more typical of recreational diving today than any of us would like to admit; that many recreational divers already have most of the links in the accident chain already forged and joined when they hit the water, and the margin for error is shaved to the point where an event that would be no more than a "glitch" in a well planned and executed dive ends up being the final link to a mishap. In this particular incident (heart attack) having a good plan and a prompt rescue may not have saved him, but the existing plan and execution of the dive made his post heart attack demise near certainty.
Plan the dive; dive the plan.
Rick