"Megastructure stretching nearly 1 kilometre long is probably one of the oldest known hunting aids on Earth.
Divers have helped to reveal the remnants of a kilometre-long wall that are submerged in the Baltic Sea off the coast of Rerik, Germany. The rocks date back to the Stone Age.
Jacob Geersen at the Leibniz Institute for Baltic Sea Research Warnemünde in Rostock, Germany, and his colleagues used camera images, sediment cores and data from reflected sound waves to characterize a string of boulders located at a depth of 21 meters around 10 kilometres from shore. In addition to ship-borne instruments, the team used human divers and underwater autonomous vehicles to explore the site.
The team counted around 1,673 rocks in a formation that stretches 971 metres. Most of the rocks weigh less than 100 kilograms and thus could be moved by small groups of people.
Analysis suggests that the structure ran along the shoreline of a former lake or bog. It was probably built by hunter-gatherers more than 10,000 years ago, possibly as a tool to guide reindeer and other large game animals during hunts. The hunting structure, which was submerged around 8,500 years ago as the sea level rose, is one of the oldest known structures of its kind on Earth." [1]
1. Nature 626, 695 (2024)
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