A sea pen (Veretillum cynomorium) is seen in the depths of Sea of Marmara at Izmit Bay, easternmost edge of the Sea of Marmara, in Kocaeli Province, Turkiye on January 08, 2023. Underwater Director of Photography Tahsin Ceylan and his crew dived in Ulasli region of Golcuk district. (Photo by Tahsin Ceylan/Anadolu Agency via Getty Images)
