An official dossier on a £1.3 billion Royal Navy submarine was reportedly discovered dumped in the toilets of a Wetherspoon pub.
It’s claimed files marked ‘official sensitive’ about the HMS Anson were left in The Furness Railway in Cumbria.
Documents apparently showed the inner workings of the ‘hunter killer’ and were used by submariners learning how to isolate and depressurise elements of its system.
However, Royal Navy officials said that files didn’t contain classified material and paperwork was all generic.
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A BAE systems shipyard is based a short distance from the Furness Railway, in Barrow-in-Furness, where the submarine has previously been pictured, The Sun reports.
A naval source said: “These documents enable submariners and contractors to understand how systems interact. They do not detail how they work, just that they exist.”
The insider also explained that the dossier only contained basic designs of the systems on board HMS Anson without detailing how they work.
The vessel is the fifth of the new Astute-class attack submarines to join the Royal Navy fleet.
They are capable of firing tomahawk missiles and described as the “largest, most advanced and most powerful attack submarines” ever used in the navy on its website.
A Royal Navy spokesman said: “These are generic training documents that carry no classified information. However, we take all security matters extremely seriously and will investigate the circumstances of their discovery.”