Most car drivers enjoy road tunnels without giving a second thought to the years of patient effort that go into the construction. In the case of the new 3.6 km-long, newly opened Vintebro tunnel near Oslo, Norway, in three minutes one can drive through a tunnel that took three years to finish and required the removal of 650,000 cubic meters of rock. The company contracted with this 76 million-Euro job was Mika AS of Oslo. Mika is a Norwegian civil engineering company that specializes in hard rock and marine contracting with particular expertise in tunneling.

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