[4] She transmitted more than 300 early air-warning alerts and spent 101 days on patrol off Argentina's Patagonian coast.

On 23 May,[5] Valiant suffered minor damage while submerged off Rio Grande when an Argentine fighter coming back from a mission jettisoned its bombs near the submarine in order to secure a safe landing.

[6] In November 2010, it was reported in Hansard that Valiant had run aground in the North Norwegian Sea in March 1991.

Her hull and reactor are currently laid up afloat at Devonport Dockyard, Plymouth, Devon, until facilities are available for the long term storage of her radioactive components.

Courageous was selected for the museum ship to represent the SSN fleet of the Royal Navy during the Cold War.