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Two Japanese submarines designed to carry bombers to strike U.S. coastal cities in World War II have been found on the seabed off Hawaii.
They had been captured by the U.S. Navy when Japan surrendered in 1945 but were sunk deliberately the following year after the Soviet Union demanded access to them.
This was because the U.S. had learned a vast amount of information from the submarines and did not want the technological secrets falling into the hands of the Soviets, their former ally.
Read more: https://www.dailymail.co.uk/news/worldnews/article-1228634/WWII-subs-Japanese-wanted-use-launch-bubonic-plague-U-S-coast-Hawaii.html#ixzz0X95IO9NE