Like most large cities these days, London exists in three dimensions. The high-rise buildings climbing into the sky are obvious to everyone, but the vital arteries below the ground - the gas, electricity and water utilities and, perhaps most of all, the London Underground - receive comparatively little attention. But subterranean London has been jolted to the surface of public consciousness in recent weeks, as the most visible phase of the development of a new part of the sub-city swings into action: the excavation of the tunnels for Crossrail.
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