Bjørvika Submerged (sunken) tunnel at the centre of Oslo. The construction of the submerged tunnel was completed as a cooperation between Bam Civiel/Volker Stevin from Netherland and Skanska Norway.
The tunnel is 670 meter long and 35-40 meter wide, and consists of ten elemennts, each 112 meter long. The elements were casted in drydock at Hanøytangen outside Bergen, then towed to Oslo and installed at the bottom of the sea in the year 2008. Approx 90 000 cum concrete was used when constructing these elements.