Diving on Oahu's east wall can be exhilarating, but working there as a dive professional can be terrifying, especially if you suddenly think you're going to pass out and drown. A physiological detective story from the undersea world!

From the tropical paradise of Hawaii to the roiling chaos of Southern California in November: Kevin and his best friend Dan discover that they teach the things they do in Open Water class for a reason.

PADI Open Water training is designed to be safe, comfortable and enjoyable. But it doesn't always work out that way. Kevin battles waves, terror and angry tirades -- but not sharks -- to find his new place beneath the sea.