World War II Japanese mega-submarine discovered off Hawaii

The I-400 was one of the “Sen-Toku” class submarines, which were the largest submarines ever built until nuclear-powered subs were invented. It could travel one and a half times around the world without refueling.

The I-400 was one of the “Sen-Toku” class submarines, which were the largest submarines ever built until nuclear-powered subs were invented. It could travel one and a half times around the world without refueling.

World War II Japanese mega-submarine discovered

off Hawaii

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