The Sunday Times has caused a furore by reporting that a 2016 test of the UK’s submarine-borne strategic nuclear deterrent ended in failure. After the submarine HMS Vengeance returned to sea following a £350M refit, it tested a Trident-II D-5 missile off the coast of Florida. Immediately after launch, the unarmed missile reportedly veered off course and flew towards the US mainland rather than following its planned trajectory towards a sea target near West Africa.
Details of the technical aspects of the failure have not been released for reasons of national security,