I was present at CYOA when this occurred, with small dive boat docked at marina where CYOA is based.

Cardiac arrest well before making it back to dock. Small dive boat (6-8 people including crew). Unfortunately, prolonged cardiac arrest without advanced medical care (drugs, defibrillator) usually unsuccessful. Dead on arrival.

Lesson: Take care of yourself. Be physically fit for the task at hand. Just because you are in Paradise does not protect you.

Prayers for family.

Again, NOT CYOA related.