Krifast is the name of the road system connecting the city of Kristiansund and the islands of Frei, Bergsøya and Aspøya to the mainland of Norway, giving 22,000 people a connection to the mainland. The most famous parts are the underwater tunnel and two of the bridges. 25 km of road and 6 km of pedestrian and bike road are also counted as part of Krifast.
There are in total 7 bridges that are part of Krifast, where the most famous is the suspension bridge from Bergsøya to Gjemnes, with 108 m high towers and a span between them of 623 m. There is also a 933 m long pontoon bridge from Bergsøya to Aspøya, which is the only bridge of its kind bound to solid rock only on each end. It is built on 7 pontoons, floating over a 320 m deep fjord.
The 5,1 km long tunnel goes under the fjord Freifjord. It is 134 meters below sea-level at the deepest, though the bottom 35 m is solid rock. A drive through the tunnel takes about 5 minutes. Because of the relatively steep climb there are three lanes at each end, but only two at the bottom.
Krifast was decided built by the Storting in 1985, and building began in october 1988. The government would finance 39% of the expences, the rest were to be taken in as toll on the road. In july 1991, 427 people were directly working on the project, and 2,000,000 Norwegian kroner (about 300,000 USD) were used daily. Four years and 1,100,000,000 kroner (160,000,000 USD) later, in august 1992, Krifast was opened for regular traffic.