06/10/2026
The Fehmarnbelt Tunnel is an 18-kilometre link between Denmark and Germany, built using the immersed-tunnel method. Huge concrete sections, each about 217 metres long and weighing over 73,500 tonnes, are made on land, floated out to sea, and carefully lowered into a trench on the seabed. The first elements were immersed in 2026, marking a major step in one of Europe’s most impressive infrastructure projects.