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'Bertha', the world's largest tunnel boring machine. She clears a subterranean tunnel that measures 57.5 feet. How else can we combat the Mole-People?

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This 19-axle rig is hauling the main drive for the tunnel boring machine that will be used to dig @Jackie Godbold Anderson's Euclid Creek Tunnel. The drive alone weights 300,000 pounds.

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from BBC News

'Metal moles' begin work below London

The first of eight highly specialised Tunnel Boring Machines (TBM), which each weigh nearly 1,000 tonnes, is being positioned at Royal Oak in west London...

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