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