An experienced Navy Diving
Instructor? I think he needs to lose that title for this stunt.
He broke a ton of safety
rules, the most obvious being that you never dive alone, and always use a dive flag to show position.
And the other divers, what were they thinking leaving the guy out there by himself, to fend for himself, unless they really disliked him and secretly hoped something bad would happen to him.
It is inconceivable to me that they would agree to let him swim to shore and then motor
off in the boat
, so I would hold those guys just as much responsible for what happened as the diver himself. Luckily he survived.