20/02/2024
https://www.smithsonianmag.com/smart-news/stone-age-wall-discovered-beneath-the-baltic-sea-helped-early-hunters-trap-reindeer-180983783/
"The discovery, named Blinkerwall, is made up of more than 1,300 stones and roughly 300 larger boulders, and it stretches for more than half a mile along the seafloor....the roughly 10,000-year-old wall was a tool built by hunters to guide and trap reindeer, which tend to travel along straight elements of the landscape, such as cliffsides or streams."
Made up of some 1,600 stones, the submerged “Blinkerwall” might be Europe's oldest known megastructure