Researchers have discovered a complete stone wall submerged off the coast of Brittany, France, which is believed to have been built over 7,000 years ago, specifically around 5000 BC. The ancient archaeological wall stretches for 120 meters, reaching a height of two meters with a width of about 20 meters. This structure was originally built on land at the western end of the Brittany coast, specifically in the region of the island of Sein, and today, due to the rise in sea levels over thousands of years, it lies at a depth of nine meters underwater. A scientific debate now rages over the original purpose of this massive structure, with some believing it may have been a sea wall or a defensive barrier built to try to hold back rising sea levels, while others suggest it was a massive fish trap, making it one of the earliest known pieces of evidence for organized fishing practices in prehistoric times. The size and weight of the wall, estimated at around 3,300 tons, reflect immense community cooperation, and the construction technique shows precision and advanced planning, as large megaliths were first placed on the bedrock, then smaller stones and slabs were laid around it. This level of organization points to a highly structured society, whether from settled hunter-gatherers or early Neolithic population groups.
