Killer Subs in Pearl Harbor
Japan's Midget Sub
Launch interactive

Japan's Midget Sub

During WWII, the Imperial Japanese Navy built and deployed hundreds of different submarines, but on the morning of December 7th, 1941, they debuted a particularly secret weapon—the Type A Ko-Hyoteki midget submarine. Five of these small subs furtively made their way toward Pearl Harbor with the mission to attack U.S. battleships from below. At a quarter the size of common fleet subs, the midgets were a technological marvel, far outperforming their western counterparts. In this interactive, explore a model of the Ko-Hyoteki deployed in the attack.—Parks Stephenson

Parks Stephenson is a Systems Engineering Manager at Lockheed Martin Maritime Systems and Sensors. He has also been a contributing member of the Marine Forensic Panel and a historical advisor to various documentary films, including James Cameron's Ghosts of the Abyss. For more on Stephenson as well as in-depth information on the fifth Japanese midget sub, visit his website,

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© | Created December 2009