ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21: An underwater photo shows swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Şebnem Coşkun - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21: An underwater photo shows swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Şebnem Coşkun - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21: An underwater photo shows swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Şebnem Coşkun - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21: An underwater photo shows swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Şebnem Coşkun - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21: An underwater photo shows swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Şebnem Coşkun - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : Swimmers are seen ahead of competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers competing in Kanlica Pier - Kurucesme route during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )
ISTANBUL, TURKEY - JULY 21 : An aerial view of swimmers taking off from Kanlica Pier towards Kurucesme during the 31st Samsung Bosphorus Cross-Continental Swimming Race in Istanbul, Turkey on July 21, 2019. ( Muhammed Enes Yıldırım - Anadolu Agency )