HMS Vanguard, the lead boat of her class in the Royal Navy, had to be towed back to her base in Scotland after the underwater mishapFrom The Daily Mail:
British and French submarines armed with ballistic missiles threatened a nuclear disaster after colliding in the Atlantic, it emerged last night.
The crash is believed to have occurred after state-of-the-art technology fitted in both vessels, which is designed to detect other submarines, apparently failed completely.
Each boat is a key part of their respective countries' nuclear deterrent, ready to unleash hugely destructive weapons at a moment’s notice.
While both countries claim that security was not comprised during the collision, wide-scale enquiries are currently underway on both sides of the Channel.
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Update: Unthinkable -- The Sun