Japan’s Lost City Beneath the Sea | Documentary History & Mystery- AMP

Politeness Forgotten
13 Video Views·Oct 31, 2026

Off the coast of Japan’s most remote inhabited island lies a massive underwater structure that has puzzled scientists for decades. Natural formation or the remains of a civilization lost beneath the sea? On Yonaguni, the boundary between history, legend and mystery is remarkably thin.🔔 Subscribe and join us on this journey around the world → https://bit.ly/GO_ASIA

00:00 — Japan’s Remote Island of Yonaguni
05:35 — The Mysterious Underwater Monument
07:49 — Could It Be 10,000 Years Old?
08:25 — Atlantis, Mu or Natural Formation?
10:27 — Diving Into the Underwater Ruins
14:15 — When Yonaguni Was Above Water
20:34 — The Rare Horses of Yonaguni
24:49 — The Island’s Darkest Legend
29:40 — Yonaguni’s Smuggling Golden Age
39:43 — The Last Traditional Weavers
44:36 — The Spirit of Yonaguni
49:32 — An Island Lost in Time

Yonaguni is one of the smallest inhabited islands and the most western point of Japan’s archipelago, much closer to Taiwan than Tokyo.

Its remoteness gives the place a singular dimension embodied in a dramatic past as well as in traditions which have all but vanished in the Northern islands. One can find there an endemic species of small horses or puzzling underwater stone structures deemed, by some people, to be the remains of an antic suken city.

Between legend and reality, tiny Yonaguni offers diverse facets, the most intriguing one being the discovery of a Japan caught in a time warp.

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"ISLAND OF THE SUNKEN CITY"
Directed by Pierre Meynadier
©AMP