KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )

KOCAELI, TURKIYE - APRIL 03: A sunken U23 German submarine, located 3 miles off the coast, at a depth of 35 meters and sunken German submarine U20 of WWII are seen near Bagirganli Harbor in Kandira district of Kocaeli, Turkiye on April 03, 2010. ( Tahsin Ceylan - Anadolu Agency )