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U.S. Navy personnel inspect the I-400’s huge watertight hangar. With missions to attack U.S. cities and blow up the Panama Canal, the Japanese aircraft carrier submarine had the potential to change the course of the war in the Pacific.

Above: U.S. Navy personnel inspect the I-400’s huge watertight hangar. With missions to attack U.S. cities and blow up the Panama Canal, the Japanese aircraft carrier submarine had the potential to change the course of the war in the Pacific.