Carl Bryson was one of the lucky ones when the USS Squalus sank during a test dive 64 years ago off Portsmouth Naval Shipyard. Twenty-six sailors were dead by the time the sub settled on the ocean floor. Bryson and 32 others spent the next 36 hours shivering from the cold, breathing foul air and wondering if they'd escape alive. They did, thanks to the efforts of Charles "Swede" Momsen, who led a daring rescue that was the fruit of his single-minded belief that deep-sea rescues were possible - at a time when most others thought they weren't. The full...