HMS Vanguard, the lead boat of her class in the Royal Navy, had to be towed back to herbase in Scotland after the underwater mishap
From The Daily Mail:
A huge disaster was narrowly avoided when British and French nuclear submarines crashed in the Atlantic, a marine engineer said yesterday.
The vessels, which are armed with up to 32 ballistic missiles between them, collided 1,000ft underwater in the Bay of Biscay.
French sailors, who were returning to base, heard a bang after HMS Vanguard apparently clipped the front of their submarine, Le Triomphant.
The French vessel's fibreglass sonar dome was shattered in the collision, causing £50million of damage.
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My Comment: One word sums up everything .... lucky.