The USS Finback was a United States fast attack submarine. It was one of the larger US Submarines and cost five million dollars. It was 311 feet long, 33 feet wide, and carried a crew of 82. Quarters were so tight that the five rescued airmen had to "hotbunk" - sleep in bunks vacated by crew members on duty and leave when the crewmen came back to turn in. The Finback primary role was combat. While Bush was on board, it sunk two enemy ships and was depth bombed. "That experience was far scarier than an airplane bombing run," Bush remembers. "At least in the plane, you controlled your destiny to some extent...but there, under the water, all you could do was hope like hell that an enemy wouldn't put an explosive on top if you."