A 10,000 year old wall submerged off Germany’s Baltic coast may be the oldest known megastructure built by humans in Europe.
In total, the wall’s stones are thought to weigh more than 142 tons and stretches for almost a kilometer.
Closer inspection of the structure, named the Blinkerwall, revealed about 1,400 smaller stones that appear to have been positioned to connect nearly 300 larger boulders, many of which were too heavy for groups of humans to have moved.
The submerged wall, described as a “thrilling discovery”, is covered by 21 metres of water, but researchers believe it was constructed by hunter-gatherers on land next to a lake or marsh more than 10,000 years ago.
Read the article at the Guardian here.