Russell played center for the Boston Celtics of the National Basketball Association (NBA) from 1956 to 1969. A five-time NBA Most Valuable Player and a twelve-time All-Star, he was the centerpiece of the Celtics dynasty, winning eleven NBA championships during his thirteen-year career.
Soviet submarine K-8. K-8 was a November-class submarine of the Soviet Northern Fleet that sank in the Bay of Biscay with its nuclear weapons on board on April 12, 1970. A fire on April 8 had disabled the submarine and it was being towed in rough seas. Fifty-two crewmen were killed attempting the salvage of the boat when it sank.
The Constantinople Flotilla was established in May 1915 and operated U-boats in the Black Sea. Bulgaria joined the campaign in May 1916, when the German submarine UB-8 was commissioned by the Bulgarian Navy as Podvodnik. In three years of operation, the Flotilla sank ships totalling 117,093 GRT.