ISTANBUL, TURKIYE - JULY 11: Scientists collect samples from Marmara Sea in Istanbul, Turkiye on July 11, 2023. Scientists from Istanbul University Institute of Marine Sciences and Management completed their summer survey of Marmara Sea, where they look into the temperature, pollution, and seasonal effects. Findings point out decrease in oxygen levels and increase in temperatures. Muhammed Enes Yildirim / Anadolu Agency/ABACAPRESS.COM