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Where did the overseas fleet sent by Qin Shihuang go?

It is said that the ancestors of Mayan civilization came from Tibet. There is a Tibetan epic saying that a man went to the ocean and didn't come back until more than ten years later. It is speculated that they went to America.

Moreover, the people in Japan are indeed young men sent by Qin Shihuang (that is, the kind who go to ask for medicine)

As for Atlantis, I have never heard of it.