Nuclear subs collide in Atlantic
 |  HMS Vanguard is now back at its home base at Faslane on the Clyde |
A Royal Navy nuclear submarine was involved in a collision with a French nuclear sub in the middle of the Atlantic, the MoD has confirmed.
HMS Vanguard and Le Triomphant were badly damaged in the crash in heavy seas earlier this month.
First Sea Lord Admiral Sir Jonathon Band said the submarines came into contact at low speed and no injuries were reported.
Both the UK and France insisted nuclear security had not been compromised.
BBC defence correspondent Caroline Wyatt said the incident was "incredibly embarrassing" for the Ministry of Defence (MoD).
She said HMS Vanguard, with "very visible dents and scrapes", was towed back to its home base at Faslane on the Firth of Clyde.
First Sea Lord Admiral Sir Jonathon Band confirms the collision took place
The submarines are equipped with sonar to detect other vessels nearby but our correspondent said it might be the case that the anti-sonar devices, meant to hide the submarines from enemies, were "too effective".
"This is clearly a one-in-a-million chance when you think about how big the Atlantic is," she said.
The two submarines are key parts of each nation's nuclear deterrent, and would have been carrying missiles, though both the UK and France have insisted there was no danger of a nuclear incident.
They were carrying around 240 sailors between them. A French naval spokesman said the collision did not result in any injuries to the crew.
Le Triomphant is based at L'Ile Longue near Brest, north-west France. HMS Vanguard arrived back in Faslane on Saturday.
On 6 February, France's defence ministry had said that Le Triomphant "collided with an immersed object (probably a container)" when coming back from patrolling, and that the vessel's sonar dome was damaged.
But in a subsequent statement, it admitted that the collision between the two submarines took place.
"They briefly came into contact at a very low speed while submerged," the statement added.
'Large ocean'
Retired Commodore Stephen Saunders, editor of Jane's Fighting Ships, said the cause of the collision appeared to be procedural rather than technical.
"These submarines should not have been in the same place at the same time," he added.
|  If there were ever to be a bang it would be a mighty big one  Nick HarveyLib Dem shadow defence spokesman |
Nuclear engineer John Large told the BBC that navies often used the same "nesting grounds".
"Both navies want quiet areas, deep areas, roughly the same distance from their home ports. So you find these station grounds have got quite a few submarines, not only French and Royal Navy but also from Russia and the United States."
In 1992, the US nuclear submarine USS Baton Rouge was struck by a surfacing Russian nuclear sub in the Barents Sea.
When the nuclear submarine HMS Trafalgar ran aground during a training exercise off the coast of Skye in 2002, the damage was estimated at
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