Tourists swam in the glowing sea On Sunday, September 8, the phenomenon was observed in several Danish ports, including Aarhus, Roskilde, and Veddelev. The water temperature in the Baltic Sea was ...

With the naked eye, Rushe said the algae appears more white with a touch of blue tint to it, but still glowing. Monica Werner-Kutter was also able to capture the lit-up waves from Crystal Beach ...