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Abstract: The Rogfast E39 coastal highway project involves the construction of a 26.7 km long and almost 400 m deep twin-tube subsea tunnel across the Kvitsøy- and Boknafjord and a tunnel up to the island of Kvitsøy. Some special features of the project are a large roundabout intersection area, and tunnels, shafts and rock caverns that will be used for the purpose of ventilation. Some of the geological...