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• The Guardian
• Wed May 28 2025

Marmara Sea, Turkey ?ahika Erc?men, the world free-diving record holder, dives with a single breath to show marine mucilage ? ?sea snot? ? which has become more visible in recent years. Mucilage in the Marmara Sea is driven by rising sea surface temperatures, the discharge of untreated waste, and the sea?s unique semi-enclosed structure, which limits water circulation. After a big outbreak in 2021, monitoring and cleanup efforts have continued, with experts reporting some improvement despite periodic increases in mucilage levels

Photograph: Sebnem Coskun/Anadolu/Getty Images