I've been diving since the 60's, certified 33 years, many a instructor rating and worked as a dive master since the 80's, a lot in Hawaii.
Known many a friend and diver that had died for various reason or become bent for dumber ones
The captain, will not and cannot leave the boat to save you.
The Dive masters work for tips,..they are not paid.
The first thing you are taught in Rescue,..is to make very sure, that you will not become a causilty or create a situation for two rescues.
noone is obligated to jump in and save your butt, give you CPR or anything else.
I've had charters try and buddy me up with a single person on the boat. Noway,.. If I do not know their abilities I will not be their buddy, .. they may get me killed.
I have no problem watching a dumb a__ die.
In 97 my wife and I were drift diving off Palm Beach. On the second back to back 60 for 60, I signaled her to come up, she refused, wanted to stay with the group with the computers. I surfaced alone. She later surfaced,..shortly after she became bent.
Sorry,...if I had stayed down, we both would have been bent.
Practice self rescue.
In fact there is a tread about a girl doing just that in the keys recently.