Beneath the pretty cotswolds countryside between Box and Corsham lies a secret city. 37 metres below ground, this vast 35 acre complex is more than a kilometre in length and boasts 60 miles of roads.  Blast-proof and completely self-sufficient, with the ability to house up to 4,000 people in complete isolation from the outside world for up to three months, the site was designed to be the operational headquarters for the British Government, in the event of a  nuclear war or conflict with the Soviet Union.Read More