Alaskan Way Replacement Tunnel (SR99 tunnel( bored by Bertha produced by Hitachi Zosen)
Seattle City Council (WCC)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 one of the 10 giant Herrenknecht Tunnel Boring Machines that are used....org.uk/news/breakthrough-for-hs2s-longest-tunn...
cover tunnel photo by: Matt Brown from London, England / CC BY
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