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A tunnel in 1917 was a secret city for 25,000 allies hidden beneath enemy camps during WW1 - the most extensive underground network in British military history. The tunnel was covered and forgotten after the war but now it is revealed curtesy of careful excavation.
Today a glass elevator takes groups of 20 into a space frozen in time.
The town of Arras, France, is an ancient area of Roman origin with an extraordinary number of underground tunnels, sewars and cellars.
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