Evidence for a Mythical 'Lost City' Discovered: 7,000-Year-Old Stone Wall Found Under The Sea!

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Published Oct 24, 2026

French archaeologists have made an amazing discovery off the coast of Brittany, a 120-metre-long, complex, megalithic structure dating back to 5000 BC.

The size of structure, which is made of stone slabs, boulders of granite and standing stones, makes it the largest underwater structure ever found in France and the fact it dates back to the Mesolithic-Neolithic transition is just astonishing, because it shows just how sophisticated people were.

What has been called an ancient monumental wall in press reports, it’s been found near Ile de Sein, a small island at the western tip of Brittany, now sitting some 9 metres underwater.

And the discovery is even more interesting because there is the story of a mythical city called Ys, which was apparently off the coast of Brittany and swallowed up by the ocean.

The legend persisted and developed for centuries, from oral traditions to published writings, songs, poems, music and art. The city’s location was said to be just kilometres east of the wall’s location and some experts think there could well be some real history behind the myth.

Watch this video to learn all about the new discovery and to see the pictures released by archaeologists in the new study!

You can also download the brand new 37-page study that has just been published in the International Journal of Nautical Archaeology:: https://hal.science/hal-05406477v1/document#:~:text=To%20cite%20this%20version:,%EF%BF%BDhal%2D05406477%EF%BF%BD

Video Contents:
0:00 Introduction
0:28 Spectacular Find off the Coast of Brittany
1:00 Details of the 7,000-Year-Old Wall
4:00 Theories For the Function of the Prehistoric Wall
5:18 Links to the Lost Sunken City of Ys
6:18 Precursor to the Stones of Carnac
7:48 A Mesolithic Sedentary Permanent Settlement
8:29 Closing Remarks

All images are taken from Google Images, Google Earth or the above paper for educational purposes only. Please Subscribe to Ancient Architects, Like the video, and please leave a comment below. Thank you.

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