Once classified tunnels built in the event of nuclear war lie deep beneath Manchester's city centre. Unknown to the majority of people who walk above them daily, the tunnels built 115ft underground are still guarded around the clock by security staff.
The underground network built in 1954 remained a secret for over a decade and their existence was only acknowledged in 1968.
The tunnels run beneath the streets between St Peter's Square and Piccadilly Gardens. The entrances to the tunnels, including two in George Street, are surrounded by barbed wire and security gates. Read More:Memories of Blackpool's Monster Drop slide where kids 'earned their stripes' The Guardian Telephone Exchange, as it is called, has a main tunnel running more then 300 yards from St Peter's Square up to the Piccadilly Plaza Hotel in the city centre.
Smaller tunnels run across the city. During the Cold War in the 1950s when the fear of nuclear war was at its height, to ensure their existence remained a secret, Polish immigrants unable to speak a word of English were employed to build them.
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