ISBN: | 978-5-5117-1216-1 |
High Quality Content by WIKIPEDIA articles! The sixth, and most recent HMS Valiant was the second of Britain`s nuclear-powered submarines, and the first of the two-unit Valiant class. She was ordered on 31 August 1960, laid down 22 January 1962, launched on 3 December 1963 by Lady Thorneycroft, and finally entered service 18 July 1966.