British and French nuclear submarines collide in Atlantic ocean
The BBC have said that it has received information that two nuclear submarines were badly damaged when they were caught in a collision at the start of the month.
The collision involved British and French Subs, the HMS Vanguard and Le Triomphant in the Atlantic ocean.
HMS Vanguard is now back at base at Faslane on the Firth of Clyde, Scotland.
Both the UK and France said there was no danger of a nuclear incident.
A Royal Navy nuclear submarine was involved in a collision with a French nuclear sub in the middle of the Atlantic, it has been reported.
It is understood HMS Vanguard and Le Triomphant were badly damaged in the crash earlier this month.
Despite being equipped with sonar, it seems neither vessel spotted the other, the BBC's Caroline Wyatt said.
The UK's Ministry of Defence is not commenting on the reports, but insisted nuclear security had not been breached.
Our defence correspondent said the submarines were both "seriously-armed".