A drone's view of the Crossrail tunnels in 90 seconds

For the first time, the BBC has been allowed to fly a remote-controlled camera along the tunnels of Crossrail.

After four months of negotiation with the Crossrail safety team, a BBC trained pilot, Jon Bontoft, was given access, along with the BBC transport team, Richard Westcott and Jonathan Sumberg.

The giant building project will eventually see trains criss-crossing London and south-east England on a brand new line, in a project costing £14.8bn.

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