While Atlantis may only be a myth, there is a Japanese monument that might be the closest thing to a real-life version of the underwater kingdom.
Dan Koh takes Neil Humphreys on a deep-sea exploration to find "Japan's Atlantis", the Yonaguni Monument that has provoked immense debate since its discovery in the 1980s.
How was it formed? Was it man-made? Was it natural? Dan examines the evidence to come up with an answer.

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