April 30, 1961K-19, the first Soviet nuclear submarine equipped with nuclear missiles, is commissioned.
K-19 was one of the first two Soviet submarines of the 658, 658м, 658с class (NATO reporting name Hotel-class submarine), the first generation nuclear submarine equipped with nuclear ballistic missiles, specifically the R-13 (missile). Its keel was laid down on 17 October 1958, christened on 8 April 1959 and launched on 11 October 1959. Its naval flag was first raised on 12 July 1960, and it completed all acceptance tests on 12 November 1960. Its official commissioning took place on 30 April 1961. Due to the large number of accidents during its construction and service life, it gained an unofficial nickname "Hiroshima" among naval sailors and officers. Over its service life, it ran 332,396 miles during 20,223 working hours.