The guy that I went through Open Water certification with found himself in 95 ft of water off the Fla keys a few weeks ago without any air left in his tank.
It was early in the dive and his air consumption had been comparable to the rest of the group.
The difference is that he dropped down off the deck of a wreck to get some pictures and then had to work in a current to get back up with the other divers. With just a little diff in depth and work load his tank was sucked empty.
Key West 1720 90 4 srtk Yamaha