Tour the Belly of a Naval Wonder

Inside a National Treasure: SS United States

USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
USS United States
The thick, watertight hatch leading to one of the two engine rooms. What is behind this door was for decades a closely guarded state secret. But today we know the ship could do 38 knots, about 44 mph. The notes were left by employees of the long defunct United States Lines. (John Griffin/ABC News)
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