In February 2002, Vanguard began a two-year refit at HMNB Devonport. The refit was completed in June 2004 and in October 2005, Vanguard completed her return to service trials （Demonstration and Shakedown Operations） with the firing of an unarmed Trident missile.
- British and French nuclear submarines crash. The Sun. Retrieved on 2009-02-16.
- British and French submarines packed with nuclear missiles collide beneath the Atlantic. The Daily Mail. Retrieved on 2009-02-16.
- Nuclear submarines collide in Atlantic. The Guardian. Retrieved on 2009-02-16.