So it does not sound like she died? "managed to bring her back on the boat with CPR"
I am not questioning your decisions not to do specific dives, I am questioning your unsupported statement linking devil's throat to needless deaths. If there is support for that statement, by all means bring it up and make a valid point!
All I see is a bunch of fear-mongering. Just saying
you will die if you dive without training and
you will die in a cave without cave training is not going to sway many people; they will just ignore
stupid statements like that, especially if they have heard of people doing those things without problems!
If one gives examples of the possible problems, with documentation of deaths or accidents, a valid case can be made for proper training. If one shows the advantages of proper training and the wonders awaiting the properly trained, the op might actually consider getting trained first.
Just Say No works about as well in diving as it does with
drugs or sex!