Water survival is taught at Pensacola Naval Air Station and is certainly a confidence builder. The experience is priceless. One concept that sticks with me from the lectures is that in the ocean you're no longer at the top of the food chain, you're somewhere in the middle.
The Navy puts you up in nice facilities and fun is certainly had by all.
*Col Storms contributed the second section from an in the water first person perspective with a waterproof disposable camera. Check 'em out.