Spiralen is a mountain tunnel in Bragernesåsen, opened in 1961 when Drammen celebrated its 150th anniversary. With six spirals, the tunnel goes through rocks ending at Breidablikk. The tunnel is 1650 metres long, 9 metres wide and originally had a height of 3.1 metres but it was extended later and today also large. The rise is from 20 to 213 metres above sea level and each spiral has a 70 metre diameter.
The city engineer Eivind Olsen gave the idea that the quarry, used ti provide road construction with materials, could be developed into a spiral tunnel up through Bragernesåsen and this work commenced in 1953 after 70,000 cubic metres of rock had been blasted off.

Info: virtualtourist.com
Music: Atrium Carceri "Through the Loop"

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