The fixed link across the Fehmarn Belt represents an immersed tunnel that will connect the island of Lolland in Denmark with the island of Fehmarn in Germany.

This impressive tunnel beneath the Baltic Sea, which is expected to be one of the longest underwater structures in the world, is scheduled to be completed by 2029.

Project Scope, Length, and Financing

The Fehmarnbelt Tunnel, with a length of 18 kilometers, will significantly shorten travel time between Scandinavia and continental Europe. The company Femern states that the tunnel is “the largest infrastructure project in Denmark and the longest immersed road and rail tunnel in the world.” Estimated costs amount to around 7.37 billion euros, while the European Union has approved approximately 1.3 billion euros for this project.

Representatives of Femern explain that an immersed tunnel is “a safe, proven, and efficient way to construct an underwater tunnel.”

“The technology was developed in Denmark and is based on experience, among other things, with the Øresund Tunnel.”

Maritime Safety and Operational Security

Once completed, the tunnel will not represent an obstacle to maritime traffic in the Fehmarn Belt. Maritime safety is also a top priority during the construction phase.

“The Fehmarnbelt Tunnel will be just as safe as a corresponding section of highway above ground. It is equipped with continuous emergency lanes and emergency exits along its entire length.”

A Landmark Engineering Achievement

The Institution of Civil Engineers explains that the Fehmarnbelt Tunnel will lie directly on the seabed, making it “an exceptional engineering feat.”

“With a weight of as much as 73,500 tons per element, these colossal structures are proof of modern engineering. When one segment is ready for transport, watertight bulkheads are installed at both ends, and the section is then carefully towed into position using tugboats.

A total of 89 elements will be connected one after another, like assembling giant Lego blocks, to form the complete tunnel.”

This article originally appeared on Autorepublika.com and has been republished with permission by Guessing Headlights.