Thanks for asking Thal....
I have a little more information. I am pretty sure of what happened, but some of it is still supposition.
Tyler (my 15 y.o. grandson) was doing a Discover Scuba with his parents. They had completed the pool, and a shallow beach dive under the program. They were offered an "optional" boat dive on Santa Rosa reef.
Tyler had a few minor problems with his mask during the beach dive, but handled it ok. On the boat dive the three of them, with one other diver, and the instructor entered the water and were descending. Between 10 to 15 feet Tyler again had problems with his mask (he was "fiddling with it") The parents and Instructor were slightly deeper, and saw him, with his hands on his mask, and he then pointed up, and started up. Both parents started up after him. (Note; rate of ascent is not known, but it not appear to be excessive.) They saw Tyler on surface in a face down float, not moving. (I dont know if the reg was in his mouth or not.) The Instructor passed them both to reach Tyler as quickly as possible.
An EMS professional (from Wisconson) jumped in, from another boat, and both of them did cpr and got him on the boat. I am not sure the stratus of the Boats oxygen, but they took the boat into the beach, where a Doctor at the resort (guest?) assisted.
Tyler was pronounced at that time.
I know there are gaps, and I am going to fill in as many as I can. I am talking with DAN, and PADI, to try and work out the complete scenario. My take is that Tyler got water in his mask, and decided to abort the dive. When he looked up, the water entered his nose, and upon hitting his throat caused a "larangospasm" this caused his throat to close, and either stopped all, or part, of the air in lungs to stay trapped. As he went up, he developed a lung expansion injury, and believe (as offered by a few other divers as a cause) had a severe Arterial Gas Embolism. Which went the Cerebral route.
If I find out more information, I will pass it on. I am not trying to place blame, but I would like to have all the information possible. It sounds to me like it was an extemely unusual series of events, that once started, had no viable ending.
I do want to thank everyone for their prayers, love, and support. The Service was Saturday, and was very well done.
Dave