BBC: " 'Metal moles' begin work below London"

Link to BBC web site

"Tunnelling work is about to begin on a grand scale in London as the £16bn Crossrail project gets set to build 26 miles (42km) of tunnels beneath the capital. 

"Described by Boris Johnson as 'voracious worms nibbling their way under London', the 150-metre long machines will take three years to build a network of tunnels beneath the city's streets."

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