HMS Vanguard and Le Triomphant submarine collision information

A *Triomphant*-class submarine (here, *Vigilant*)

The submarines HMS Vanguard of the Royal Navy and Le Triomphant of the French Navy collided in the Atlantic Ocean in the night between 3–4 February 2009. Both nuclear-powered ballistic missile submarines sustained damage, but no injuries or radioactivity releases were reported.^[1] At the time of the collision, both vessels were submerged and moving "at very low speed" according to the UK Ministry of Defence. Both are equipped with active and passive sonar, although only the latter is used on an operational patrol.^[2]

^ "Nuclear subs collide in Atlantic". BBC News. BBC. 16 February 2009. Retrieved 16 February 2009.
^ Byers, David; Bremner, Charles (16 February 2009). "British and French nuclear submarines crash in Atlantic". The Times. London: News International. Retrieved 16 February 2009.

[BBC-1] "Nuclear subs collide in Atlantic". BBC News. BBC. 16 February 2009. Retrieved 16 February 2009.

[Times-2] Byers, David; Bremner, Charles (16 February 2009). "British and French nuclear submarines crash in Atlantic". The Times. London: News International. Retrieved 16 February 2009.