I can tell you that a minimum of two instructors were on board.1.) Was the 'Instructor' just a customer on the boat that day doing a recreational dive, or was he there in the capacity of an Instructor? A number of people in other threads on this forum have written of the practice of just providing an AOW cert. to qualify for boat dives, not Instructor, DM (or maybe even Rescue Diver?) in order to avoid liability exposure or getting expected to supervise/be responsible for other divers.
There are times when the charter is for injured vets to experience diving in the ocean and there are times when certifications are conducted or both.
I can guarantee one instructor knew the age of the young man and pretty certain one other did too. If there was more than two instructors on board I would suspect the other(s) did too.2.) Did the Instructor know this teen as underage? With a 15 year old it may sound like a goofball question, but some people look much younger than they are.
See #23.) Did the 'Instructor' know the experience of these two? When people on the forum speak of pre-dive discussion, I wonder how many ask detailed questions about # of prior dives & where they were? I suspect people often inquire to get a sense of whether a buddy will be competent; I wonder how many try to screen potential buddies so as to police them?
I can't say what paperwork was in place on this particular instance, but I can say that there was a supervising adult and I'm sure it was on record he was 'responsible" for him4.) When a 15 year old books with a dive boat, what extra paperwork/requirements are involved over an adult? Just a signed consent for him to dive? Does he have to bring an identified supervising adult? Does some adult have to go on record as 'responsible' for him?