This made me think about an episode of Extreme Rescues that I saw where a Chevron boat had capsized in the Atlantic. They were finally able to send divers down on a “recovery” mission to bring the corpses back up for burial. They ended up finding a guy alive in there who found an air pocket. It was really incredible. If you get a chance to watch the show on Hulu, I recommend it. Here’s a YouTube clip of when they found the guy.