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Continue to ChatJust 10m of drill and blast left on Gotthard Base Tunnel https://geoprac.net/2010/10/just-10m-of-drill-and-blast-left-on-gotthard-base-tunnel/
Just 10m of drill and blast left on Gotthard Base Tunnel https://geoprac.net/2010/10/just-10m-of-drill-and-blast-left-on-gotthard-base-tunnel/