A colossal 7,000-year-old granite wall, France’s largest underwater construction, has been unearthed off Brittany’s coast. This 120-meter structure, found with smaller man-made elements, offers profound insights into early coastal societies and their ingenious adaptations to rising sea levels. Experts suggest it may have served as a fish trap or a protective dyke, showcasing remarkable Mesolithic or early Neolithic engineering skills.
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