Construction South Portal Second Tube Predor Karavanke, Slovenia
Construction South Portal Second Tube Predor Karavanke , Slovenia (by DARS from Wikipedia https://en.wikipedia.org/wiki/File:Predor_Karavanke_Construction_Site_15.jpg)China Railway Tunnel Group TBM breakthrough at Georgia Gudauri Tunnel
China Railway Tunnel Group (CRTG) TBM breakthrough at Georgia Gudauri Tunnel photograph is press release of CRTG https://www.prnewswire.com/news-releases/successful-breakthrough-of-gudauri-tunnel-in-georgias-north-south-corridor-kk-highway-project-302124845.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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