Innovation beneath the surface: the engineering behind the Fehmarnbelt Tunnel

30-08-2026
Delivering the world's longest immersed tunnel requires innovation, precision and international collaboration
Floating caisson

Copyright Femern A/S

The Fehmarnbelt Tunnel between Denmark and Germany is one of Europe's most ambitious infrastructure projects. Once completed, it will be the world's longest immersed tunnel, creating a vital transport link across Northern Europe. TEC has been involved since the early stages of the project, contributing specialist expertise in immersed tunnel engineering, design integration and technical assurance as part of the RAT Joint Venture. 

Projects of this scale require more than technical excellence alone. They demand close international collaboration, innovative engineering solutions and a shared commitment to delivering infrastructure that will serve generations to come.

The project was recently featured in Het Financieele Dagblad (FD), highlighting the contribution of Dutch engineering expertise to one of the most complex underground infrastructure projects currently under construction. 

Read the FD article and discover how international teams are helping to deliver this landmark project.

Piet Barten - Specialist Immersed Tunnels

Piet Barten

Specialist Immersed Tunnels