The International Information Center for Structural Engineers

The Fehmarnbelt fixed link in the Baltic Sea will connect the Danish island of Lolland with Germany's Fehmarn island and is expected to boost transportation between central Europe and Scandinavia. Spanning 17.6 km, it will be by far the world’s longest road and rail immersed tube tunnel (IMT), comprising of a four-lane motorway and a double-track railway. The Fehmarnbelt link will cut journeys across the sea from 45 minutes to about 10 by car and 7 by train.

Slated at $10 billion, construction on the Fehmarn Belt Fixed Link could start as early as this year. At 11 miles long, the completed project will be the longest immersed tunnel in the world. It will run beneath the Baltic Sea and connect Denmark to Germany between the islands of Lolland and Fehmarn. Long in the planning, the bill finally giving the project the green light passed its first reading in the Danish Parliament this month. Construction could be completed as early as 2024.