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Scientists Map Vast Subsea Freshwater Under Greece’s Gulf of Corinth

Peer-reviewed estimates point to a potential new water source that would require careful study before any use.

Overview

  • The University of Malta–led team reports roughly 250 cubic kilometers of freshwater sealed beneath the gulf for about 800,000 years.
  • Mapping shows reservoirs from roughly 15 to 700 meters below the seafloor, with pockets just 15–100 meters deep east of the Alkyonides islands.
  • Researchers combined offshore drilling, seismic imaging and computer simulations to delineate the subsurface system.
  • The estimated volume could cover Greece’s drinking-water demand for at least two decades, as the country faces intensifying drought and soaring consumption.
  • Scientists warn of ecological risks and say no extraction is planned, while the government continues a €535 million river-transfer project slated for completion by mid-2029.