At https://phys.org/news/2025-12-ancient-undersea-wall-dating-bc.html … divers have discovered a long submerged wall that dates around 7000 years ago. It is under the sea off the coast of western France. Britanny, to be precise. In other words, it is almost opposite the walls that go down into the sea off the Isles of Scilly. It seems to be part of widespread sea level changes associated with the 6200BC event. For example, in the same general region of NW Europe the southern basin of the North Sea was drowned and in the Solent, the sea flooded what was once a dry valley in the very south of Britain, submerging a Mesolithic boat yard and evidence of human occupation, below Bouldner Cliff. Land off Cornwall and Devon, both Ireland and Northern Ireland, and the western Isles of Scotland, were likewise drowned by the sea. A similar situation prevailed across the other side of the Atlantic, large areas of the continental shelf system disappeared beneath the waves. On the other side of the world Sunda Land was drowned, separating what became the islands of Indonesia from the SE Asian mainland.
The wall, as measured, comes out at 10m in length. They are thought to date between 5800 and 5300BC and are in 9m of water. A very big jump in sea levels. They were constructed when the sea bed was much lower than in the modern world. Is it as simple as that?
The stones, significantly, are comparable to those used in huge stone arrangements or monuments that still exist on what would have then been, high ground. Britanny is famous for its stone rows. However, this is a wall and the closest parallel, at the moment, is with the drowned walls of the isles of Scilly. Once a much larger and possibly single land mass. There is a link to the published article in the International Journal of Nautical Archaeology.
Meanwhile, at https://dailygalaxy.com/2025/12/ai-discovers-5000-year-old-civilizations-beneath-desert/ … artificial intelligence was used to uncover a 5000 year old civilisation hidden beneath the Empty Quarter of the Arabian peninsular. It dates back to just prior to 3000BC. At this time there was also evidence of sea level changes – drowning coastal valleys around most of the coastline of NW Europe. Not as dramatic as the sea level changes at 6200BC, or shortly thereafter, but enough to mark the last major sea level event to alter the coastline of Britain. It has remained virtually the same ever since.
Researchers in South America have also identified 300 new Nazca geoglyphs by using image recognition algorithms. A1 models used with satellite imaging are doing what researchers on the ground could not see. Uncovering long lost cultures hidden beneath shifting sands and arid plains.