HS2 TBM 'Florence' breakthrough after boring 16km long Chiltern tunnel.
High Speed 2 project, the HS2 TBM 'Florence' breakthrough after boring 16km long...st-tunnel https://mediacentre.hs2.org.uk/resources/f/construction/chiltern-tunnels/images-tunnelling-and-the-sou...
cover tunnel photo by: Matt Brown from London, England / CC BY
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