Norway new tunnel contracts 11 November 2022 press release https://kommunikasjon.ntb.no/pressemelding/tunnelkontrakt-ute-i-markedet?publisherId=17847490&releaseId=17946557&lang=no
RCCAO - Major Cost Drivers in Tunnel Projects - Toronto, Canada.
From the RCCAO report titled: Station to Station. Why Subway Builing Costs Have Soared in the Toronta Region'
Unusual geology discovery at Bergå tunnel at E6 Helgeland in Norway.
Statens vegvesen press release via https://kommunikasjon.ntb.no/pressemelding/full-stopp-etter-uvanlig-funn?publisherId=17847490&releaseId=17952219