Well if they don't have to breath then their bodies won't have air inside them and they will not be buoyant. Theire is a chance(small but still a chance that i refuse to take in this scenario) that one may be able to walk across the ocean floor. Find the pilons and climb up. All it takes is one to ruin your day!!!
99 WJ,4" Lift, 265/75/16 Treadwrights, RC wheel spacers, Sound System, CB, HID's with amberless headlights, Rola Rack...ect.ect. Money pit!