Nagato was a super-dreadnought battleship built for the Imperial Japanese Navy (IJN) during the 1910s. The ship was modernized in 1934–36 with improvements to her armor and machinery and a rebuilt superstructure in the pagoda mast style. Nagato was the flagship during the attack on Pearl Harbor.
For Test Baker, an underwater explosion, the ship was positioned 870 meters from ground zero. Nagato rode out the tsunami of water from the explosion with little apparent damage. A more thorough assessment could not be made because she was dangerously radioactive. Her list gradually increased over the next five days and she capsized and sank during the night of 29/30 July.
The wreck is upside down and her most prominent features are her four propellers, at a depth of 33.5 meters below the surface.
