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Video | State of the art way to drill 250,000 holes under London

Crossrail Thames tunnel

A state-of-the-art rig is to roll through the Crossrail tunnels drilling more than 250,000 holes in the tunnel lining.

A first machine will drill all the holes to accommodate brackets for cabling, walkways and fire mains, while a second will focus on the holes for the overhead electricity line to power the new Crossrail trains.

The rig can move along the tunnels on both the track and on wheels in sections where the track has not yet been laid.

Crossrail will be known as the Elizabeth line when it opens to passengers through central London in December 2018.

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