Overview
- Geologist Yves Fouquet first noticed linear anomalies on a laser-based seabed map and launched an underwater investigation.
- Roughly 60 dives documented 11 man-made stone structures near Île de Sein, including a granite wall about 120 meters long at roughly 9 meters depth.
- Laboratory dating places construction between 5800 and 5300 BCE, significantly earlier than Brittany’s famed Neolithic menhirs and dolmens.
- Researchers say the purpose remains uncertain, with hypotheses ranging from sea-defense works to fish traps or hunting installations.
- The International Journal of Nautical Archaeology publication underscores the builders’ technical capabilities and social organization, prompting calls for further study.