Penetrating seawater carries bacteria that form colonies – biofilm. The bacteria attack the concrete that is supposed to prevent stones from loosening from the tunnel walls. The concrete becomes porous and risks breaking apart. The biofilm...

source AF Gruppen press release: tunnel https://www.afgruppen.no/nyheter/2025/04/gjennomslag-i-fabergtunnelen/

No er det klart kven som skal byggje ny E134 mellom Røldal og Seljestad It is now clear who will build the new E134 between Røldal and Seljestad source:...

Epiroc Tunnel Intelligence System use at Rogfast Tunnel source: https://www.epiroc.com/en-us/newsroom/2024/epiroc-delivers-tunneling-intelligence-at-worlds-longest-and-deepest-undersea-tunnel

EarthGrid Plasma torch source: https://www.prnewswire.com/news-releases/earthgrid-announces-groundbreaking-joint-venture-with-enertech-a-kia-entity-to-deploy-18b-in-us-underground-utility-projects-302250009.html

New road and tunnel between Breivika and Lerstad in Ålesund Municipality in Norway. image by Statens vegvesen via NCC press release...

Oslo E18 road, Norway from: https://group.skanska.com/media/press-releases-articles/273188/Skanska-builds-highway-in-Oslo%2c-Norway%2c-for-NOK-4.6-billion%2c-about-SEK-4.6-billion

Iceland Vestmannaeyjar (screen shot from Apple Maps)

image by Vann- og avløpsetaten/Oslo kommune

drawing: Oslo Municipality