Yonaguni mystery
The Yonaguni mystery refers to the intense debate surrounding a 50-metre-long, submerged rock formation off the coast of Japan’s Yonaguni Island, discovered in 1987. It features, straight edges, sharp, 90-degree angles, and staircase-like terraces. Which some serious some researchers believe it is a man-made, 10,000-year-old "Sunken City".
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