A large number of dead fish washed up on the beach in Hanko, Southern Finland on January 29, 2025. Dead fish washed ashore coinciding with the appearance of an unidentified white substance in Hanko, along a 20-kilometre stretch of coastline. Authorities are investigating possible links between the two incidents. The dead fish, mostly herring and sprat, were first reported on Tuesday in areas around Hanko's winter swimming facility and Regattaranta beach. LEHTIKUVA / MARKKU ULANDER - FINLAND OUT. NO THIRD PARTY SALES.