Just so you know, the diver you are talking about is one of the most famous and most accomplished divers in the world. His "nothing to see" comment is frustration because their purpose in the dive was to find new fish species. That diver and his team have probably identified more new fish species than any other group in the world, and so they probably spend a lot of time seeing nothing and being bored before they make a big discovery.I would think someone should have called the dive when it became obvious that the effected diver was very uncomfortable. I don't just mean that he was cold, but at one point he asked if they should surface, and he kept making references to how there was nothing to see, it was boring, etc.