thanks missD for the story... pretty scary actually to say the least.
There are a lot of lessons to be learned on this in my view after reading your story :
1) The instructor failed in his duty to do a correct briefing let alone course training, a briefing is not "in, out, put the kettle on". It is the integral part of the dive, and a lot of what happened would not have with a good briefing.
Points which should have been included:
- Buddy pairs
- entry procedures
- dive plan (time & depth)
- 5 point descent on mooring line
- exercises to do underwater
- distinctive sign on the instructor (like a cross chem. or something likeso on the tank)
- Lost diver procedures (search 1mn & surface no ??)
- Emergency surfacing procedures (in the eventuality of a problem.. how do we know when we're down there that we need to surface... what is the signal...)
- Remind people to do a buddy check.
For the Instructor, the choice & decision to call the dive or change the divesite is essential, and with the current, the storm & weather conditions for a training night dive... i'm affraid to say this was a bad call (imho).
For the strap on the diver, you reacted really well. Did you all continue your dive and let him go or did you group together ? The best procedure would have been to search for 1mn and surface... to find his actual buddy having done the same thing after a proper briefing.
Now, for the sake of the diver in the 7mm suit, well maybe someone experienced should have spoken to this person when he was getting equiped ? a rescue diver, a DM or someone to sense a problem ... maybe, just maybe this would have pointed out an issue. Where was the instructor at the time of the stroke when you came back up? should he not have been the one doing the CPR or coordinating the rescue & divers pickup ?
I hope that you still dive, and that you have searched for help if you definitely have nightmares about this. You certainly must find another op charter, because that one seems like it was horrendous.
There is certainly a lot more to say, but i feel that more will come with time... let's start slowly.