zecats
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Except in the movie "Open Water" which is based on a true story of 2 divers left behind at the Great Barrier Reef due to inaccurate headcount. (The movie is set in the Bahamas.)From what I'm reading about dive boats, it should be very clear who was on the boat. They keep good records because the crew needs to keep track of divers in the water and make sure all divers who go in the water come back out of the water. So it won't be a guessing game on who was registered with the company to take the trip.
Source of my info: wikipedia link posted upthread
In this case though, everyone was onboard, so you're right. There should be a log with correct number of passenger and their names. Would that log be onboard though and burned also? Must be a copy back in Santa Barbara for record keeping.
Being a dive boat with unlimited O2 refill, the theory stated above is definitely possible, that the oxygen may have played a part.