The largest tunnelling machine ever used on a UK rail project is officially starting work.
Florence – named after Florence Nightingale – will spend the next three-and-a-half years cutting through the chalk beneath the Chiltern hills in Buckinghamshire.
The tunnel will form part of controversial high-speed rail project HS2’s first phase, which will link London with the West Midlands.
The BBC takes a look inside the operation to see how it works.
Video journalist: Samantha Everett
https://www.bbc.co.uk/news/uk-57093884,
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