For all the complex techniques required to succeed, the objective is remarkably simple: Go as deep as you can go on one breath and return to the surface without passing out or dying.
This is the point of freediving. At least the competitive point. And here in the Bahamas, 42 divers from around the world have gathered, like filings to a magnet, at a geological marvel called a blue hole, in this case a 660-foot elevator shaft of ocean water, to see how many stories they can plunge themselves down.
More here – GQ