Wow. There are so many mistakes in this whole incident pit by all parties, including the injured diver(s), I can't even count them. Not planning their dives, going beyond their training and experience, not researching the challenging dives they were getting into, not insisting on a thorough briefing, not checking that there was oxygen available on the charter, using a gas (Nitrox or EANx) that they're not trained for, using a computer that they don't know how to use, allowing someone else to set their borrowed computers, not comparing their gas or units of measurement until after getting out of the downcurrent, apparently not asking for oxygen after the dive, contemplating in-water recompression when symptoms were already out of control and moments before he went unconscious... etc.