I’VE THOUGHT OF DOING THIS, BUT I’VE NEVER GOTTEN AROUND TO IT: Free Divers Defy The Limits of Science, And We’re Beginning to Understand How. I wouldn’t try the absurd 700 foot stuff, but I was talking to a free diver on Cayman when they had a competition going, and he told me he could train me to do 150 feet in a day. But I’ve never gotten around to it.

I’m probably better off with a tank of Nitrox on my back anyway.