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 1800 metres (5900 ft) and −45 m (−148 ft) elevation at the deepest.The tunnel was previously also known as the Mountain Line (Fjellinjen) and the Oslo Tunnel (Oslotunnelen).
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