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Divers Find 8,500-Year-Old Coastal Settlement Off Denmark Preserved Under the Sea

The EU-backed mapping effort aims to date drowned forests with tree-ring analysis to reconstruct the pace of post-glacial sea-level rise.

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Dendrochronologist Jonas Ogdal Jensen looks at a suspected Stone Age tree trunk, unearthed at an 8,500-year-old coastal settlement submerged in his lab at Moesgaard Museum in Aarhus, Denmark. Aug.18, 2025. (AP Photo/James Brooks)
Underwater archaeologist Peter Moe Astrup inspects a tiny animal bone, unearthed at an 8,500-year-old Stone Age coastal settlement submerged by sea level rise in Bay of Aarhus in Aarhus, Denmark. Aug.18, 2025. (AP Photo/James Brooks)
A suspected Stone Age tree trunk, unearthed at an 8,500-year-old coastal settlement submerged by sea level rise in the Bay of Aarhus Aarhus Denmark. Aug.18, 2025. (AP Photo/James Brooks)

Overview

  • Archaeologists excavated about 40 square meters roughly 8 meters below the Bay of Aarhus, recovering animal bones, stone tools, arrowheads, a seal tooth and worked wood.
  • Oxygen-poor seabed sediments kept organic material intact, which the team describes as a "time capsule."
  • The work forms part of a €13.2 million, six-year project with partners in Aarhus, the University of Bradford and Germany's Lower Saxony Institute for Historical Coastal Research.
  • Dendrochronology of submerged stumps will pin down when coastal forests drowned, informing reconstructions that suggest sea levels rose about 2 meters per century around 8,500 years ago.
  • Further dives are planned off Germany and at two North Sea locations as analyses get underway to understand Mesolithic coastal lifeways and guide seabed management for offshore infrastructure.