BBC: "Crossrail project: Digging to start on London tunnels"

Link to BBC web site

"They look like a movie prop from 'Journey to the Centre of the Earth' but the Tunnel Boring Machines (TBMs) unveiled in Germany are the real thing. Each one weighs 1,000 tonnes and is longer than a football pitch. 

"In March, the first of eight of these giant machines will start burrowing under central London to carve out the tunnels for Crossrail, Europe's biggest civil engineering project."

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