Beneath the waves off Japan's Ryukyu Islands, a series of mysterious pyramid-like formations has fascinated divers and geologists ever since the site was discovered in 1987.
In 1987, a local diver exploring the coast of Japan's southern Ryukyu Islands stumbled upon an astonishing discovery. Twenty-five meters below the surface, he saw a series of almost perfectly carved steps with straight edges. Today known as the Yonaguni Monument, this enormous behemoth, measuring 50 meters long and 20 meters wide, is one of the world's most unusual underwater sites.
Nicknamed \"Japan's Atlantis,\" the rectangular, stacked, pyramid-like monument is believed to be more than 10,000 years old. Some believe it is all that remains of a long-lost Pacific civilization, possibly built by Japan's prehistoric Jōmon people, who inhabited these islands as early as 12,000 BC. Others argue that the site resembles natural formations found elsewhere in the world with distinctly defined edges and flat surfaces, such as Giant's Causeway in Northern Ireland, whose thousands of interlocking basalt columns were formed by a volcanic eruption millions of years ago.
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