Norwegians do not play when it comes to thinking about ways to get around the difficult geography of the coastal zone of their country.
Norway’s characteristic fjords prevent the use of conventional ways of diverting traffic, with escarpments that enter tortuously through the sea, but which are torn by small incursions of the sea currents.
Even so, you have to get cars through that area. Today, making the trip from Kristiansand to Trondheim takes 21 hours to complete, and requires to use no less than seven boats, for a total of almost 1300 km. Going through Oslo and Lillehammer is no alternative. The alternative may be a gigantic floating tunnel, which can circle the fjords, always in the water, and do not need transportation to stop for whatever reason.
Vegvesen, the public administration of the Norwegian roads, proposes the creation of a tunnel that will be submerged, more than 20 meters from the surface, and which will essentially consist of cement tubes of 1700 meters in length. Visible pontoons above water would be used as stabilizers. There are other hypotheses, including combinations of bridges with underground tunnels, such as Denmark’s connection to Sweden, and even a suspension bridge three times the size of the Golden Gate in San Francisco. However, the latter would be much more expensive than the EUR 22.4 billion required for the construction of the tunnel.