1. Skip to content
  2. Skip to main menu
  3. Skip to more DW sites

World's longest undersea tunnel gets even longer

03:08

This browser does not support the video element.

Miltiades Schmidt
July 9, 2025

Fehmarn Belt Tunnel: Construction of world's longest immersed tunnel has hit a milestone. The first elements are being lowered into the sea. The link between Germany and Denmark will save 160 km - and boost rail and road traffic in northern Europe.

The Fehmarn Belt Tunnel, set to become the world’s longest longest immersed tunnel, is under construction between Germany and Denmark. This €7.5 billion project, funded entirely by Denmark, will shorten travel by 160 kilometers and support the EU’s goal of improving rail connectivity and reducing short-haul flights. Despite delays caused by late ship deliveries, the first tunnel element is expected to be lowered in 2025, with completion aimed for 2029. The tunnel’s design includes watertight seals and reinforced walls to ensure safety against crashes and water intrusion. Once operational, it will charge a €73 toll for cars, while train tolls are yet to be determined.

 

*This video summary was created by AI from the original DW script. It was edited by a journalist before publication.

Skip next section DW's Top Story

DW's Top Story

Skip next section More stories from DW