Quiz on the Submarine I-400 of the Imperial Japanese Navy (IJN)

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The History of the Submarine I-400 of the Imperial Japanese Navy IJN


The idea of the super-submarine concept was credited to the Admiral Isoroku Yamamoto. The purpose was to be able to attack U.S. cities using aircraft based on submarines, which could allow to the fleet to return to Japan without being detected or attacked. The operation was fueled in part by the success of the Pearl Harbor attack. The details of the study was assigned to the Captain Kameto Kuroshima.


IJN I-401, with its long plane hangar and forward catapult

IJN I-401, with its long plane hangar and forward catapult

On 13 January 1942, an advanced proposal was prepared which involved a number of large submarines capable of making three round-trips to the west coast of the United States. Moreover, this fleet was expected to do these trips without refueling or one round-trip to any point on the globe. Each submarine was able to carry several aircrafts to perform bombing and torpedo attacks. By 17 March, general design plans for the submarines were finalized and construction of I-400 commenced at several dock yards.

However, after Yamamoto’s death in April 1943, the plans for these submarines were significantly changed. In spite of that, the planned operations could have changed the History of the Pacific War. To learn (or challenge your knowledge!) more about the history of the Imperial Japanese Navy Submarine class I-400, complete the following Quiz:

A model kit from Aoshima manufacturer at /1700 scale of the I-400 submarine:

Another model from Skywave manufacturer that shows the seaplanes:

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