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Underwater Wall of the Island of Sein: What We Know, What We Still Don't Know (and Why Ys Comes Back in the Story)

Summary by Unidivers
About ten kilometres west of the Island of Sein, under nine meters of water and in one of the most tormented areas of the Breton coast, a monumental structure has just entered the field of archaeological research. Long about 120 meters, about twenty meters wide, hijacked by 62 monoliths erect, this submerged stone wall could date from the end of the Mesolithic, nearly 7,000 to 8,000 years ago. An exceptional discovery that sheds light on a new d…
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About ten kilometres west of the Island of Sein, under nine meters of water and in one of the most tormented areas of the Breton coast, a monumental structure has just entered the field of archaeological research. Long about 120 meters, about twenty meters wide, hijacked by 62 monoliths erect, this submerged stone wall could date from the end of the Mesolithic, nearly 7,000 to 8,000 years ago. An exceptional discovery that sheds light on a new d…

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Unidivers broke the news in on Monday, December 15, 2025.
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