Operatunnelen, Festning Tunnellen segment (Oslo)

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The Festning Tunnel (Norwegian: Festningstunnelen) is a motorway tunnel on European Route E18 in the city center of Oslo, Norway. The tunnel has two tubes, with three lanes in each. It runs from Bjørvika, under Akershus Fortress, The City Hall Square and Vika to Filipstad. The tunnel is 1,800 metres (5,900 ft) and −45 m (−148 ft) elevation at the deepest.[1]
The tunnel was previously also known as the Mountain Line (Fjellinjen) and the Oslo Tunnel (Oslotunnelen). The name Fjellinjen was since taken over by the company responsible for charging toll fees on the urban toll ring in Oslo. The tunnel changed its official name from the Oslo Tunnel to the Festning Tunnel in 1998 to avoid confusion with the railway tunnel with the same name. In 2008 and 2009, the electrical installation in the tunnel is being upgraded, financed through toll fees, costing NOK 240 million.