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As indicated by their map of Pearl Harbor, the mission of the two-man crew on mini-sub HA-19 was to slip into the shallow harbour and launch their single torpedo. Handwritten notes indicate locations for US warships as determined through espionage.
Espionage and other intelligence gathering went into the making of the Japanese charts of Pearl Harbor indicating the position of US ships on Carrier Row and Battleship Row.
A Japanese chart retrieved after the battle detailed an anchorage off the Hawaiian island of Maui where the Japanese thought part of the Pacific Fleet might be moored.
The Japanese mini-submarine HA-19, one of only five such vessels assigned to the attack, was captured. It served as an attraction in rallies promoting the sale of US war bonds.