the sea of marmara. a thick layer of the slimy sludge is blanketing harbours, shorelines and the sea bed. courtney bembridge has this report. this is the so—called sea snot suffocating the seabed. a thick slimy layer of organic matter has spread through the sea of marmara, south of istanbul, threatening marine life and the fishing industry. translation: 0f fishing industry. translation: of course this affects our work. look at the mussels and the sea snails. you know what it does to the shellfish? it prevents them from closing up against. all of the sea snails here are dead, the fish die, they can't breathe. scientists say climate _ they can't breathe. scientists say climate change, - they can't breathe. scientists| say climate change, pollution and waste water have contributed to the problem. this vision was filmed by a team at bbc turkish. they dived