On August 28, 1945, two US destroyers intercepted a massive Japanese submarine several miles off the coast of Honshu, Japan's biggest island. The submarine, which was larger than either US ship and nearly as wide, surrendered without incident.
A day later, the US submarine USS Segundo found a similar Japanese submarine nearby. After a brief escape attempt, the Japanese crew, knowing the war was over and they were out of options, surrendered.
The captured submarines were enormous — 400 feet long and 39 feet wide, easily making them the largest submarines in the world at the time. They also had a massive empty chamber in their center, leading the first Americans who boarded them to believe they were for cargo.
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