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A WW2 secret Japanese submarine

During World War II, Japan stunned the world with a top-secret innovation: the I-400-class submarine, the first and only ...
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40,000 mile submarines and 800kg bombs: Japan’s global strike plan

Japan’s I-400 class submarines were among the largest ever built, capable of traveling over 40,000 miles while carrying multiple aircraft. The Seiran floatplane was designed to fold, deploy, and ...