Norway's Underwater Floating Tunnel

Norway’s underwater floating tunnel, an ambitious plans to create “underwater bridges,” suspended by floating pontoons.

To drive the 680 miles from southern port of Kristiansand to Trondheim in the north, you must spend 21 hours., an average of 30 miles per hour.

The new $25 billion project will to cut the trip to just 10.5 hours, by installing submerged floating bridges by 2035.