7,000-year-old underwater wall raises questions about ancient engineering — and lost-city legends
- Scientists found a massive underwater wall off the coast of France that might help explain the origin of the legend of Ys.
Big Think By Frank Jacobs
Jan 13, 2026
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The structure consists of some 60 massive granite monoliths, set directly onto the bedrock in pairs at regular intervals. Smaller slabs and packing stones fill in the gaps, locking the whole into a single, deliberate construction. With an estimated total mass of around 3,300 tons, this is the largest underwater structure ever discovered in France.
The team named it TAF1, after Toul ar Fot, the Breton term for this stretch of sea (in English: “Hole of the Wave.”)
TAF1 is not just massive; it’s ancient as well. By reconstructing ancient shorelines, researchers dated the wall to between 5,800 and 5,300 B.C. That’s centuries older than Stonehenge, and millennia older than the pyramids of Giza.
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Once again demonstrating how little humanity knows about anything, in this case about the past. Stunningly pushing back the “oldest” label from Stonehenge. (I’ve seen it personally and, as a fat old white guy injineer, all I could think was “NFW did humans do this without heavy equipment”! Some smart people have found that with sand and wobbling big <synonym for excrement> could be moved. But vast distances? Here’s an example of “hunter gatherers” doing big construction.
Bottom line: Where there is a will; there’s a way. And, don’t underestimate any human no matter what you think, they are geniuses just waiting to prove your pre-conceived notions wrong.
“People who say it cannot be done should not interrupt those who are doing it.” George Bernard Shaw
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