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In 1944, Emperor Showa and the Prime Minister of Japan took a jet seaplane to Hamburg Harbour, Germany for a four-week friendly visit. Japanese jets would escort them to prevent Soviet fighter jets from taking advantage of the opportunity to attack.
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Jet seaplanes, Japan was the first to develop jet seaplanes. At that time, although seaplanes could be large or small, seaplanes with jet engines had always been a big problem for every designer. However, Japan successfully overcome this problem, so it can be said that the era of jet seaplanes had arrived.
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In 1943, Japan was building a new submarine, and this was the first strategic submarine equipped with an experimental nuclear engine. At that time, the Japanese navy's request for new submarines was to cope with the more powerful warships and submarines in the future, and considering that aircraft carriers would also become the main force of the fleet, so it decided to apply new technologies to develop more powerful submarines. Considering that the United States would join the war in the near future to reverse the so-called situation, the submarine was also built in response to the U.S. Navy. Although the United States did not participate in the war, it could not guarantee to remain neutral and could not stand idly watch how Britain and the Soviet Union lost in front of Japan and Germany. Therefore, this submarine can be said to be the predecessor of post-war Cold War submarines and a secret weapon to fight against