dcsimg Fehmarn: The world's longest road/rail tunnel - Ramboll Group
Engineers discussing the Fehmarnbelt tunnel
Project data
Client: Femern Bælt A/S
Completion: 2021

Services we provided
Building physics
Electrical engineering
Construction and Contract Management
Digital modelling
Fire & safety
Geophysical surveys
Ground engineering
Ground engineering
Immersed tunnels
Infrastructure Asset Management
Landscape architecture and spatial planning
Landscape architecture
Lighting design
Mechanical engineering
Tunnel engineering
Road & motorway engineering
Ports & marine structures
Project management
Rail engineering
Structural engineering
Transport planning, traffic engineering and traffic safety
Tunnel safety

Fehmarn: The world's longest road/rail tunnel

Fehmarnbelt between Denmark and Germany ¤

A tunnel link under the Fehmarnbelt will realise the vision of a permanent, close and direct link between Scandinavia and Central Europe. An immersed tunnel under the Fehmarnbelt is now the preferred solution for Danish politicians.

The immersed tunnel solution under Fehmarnbelt is a study in innovative thinking, as it challenges existing tunnel building standards. It improves functionality through its pioneering longitudinal ventilation system and state-of-the-art safety and security features.

The total length of the Fehmarnbelt tunnel will be approx. 18 km from tunnel mouth to tunnel mouth. At a speed of 110 km per hour, this will offer motorists a journey time of approximately 10 minutes through the tunnel. For train passengers, the journey will take seven minutes from coast to coast.

On completion, the tunnel will be a reliable facility that will be open all year round, also on windy days and when it snows.

The construction of one of Europe’s biggest infrastructure projects is expected to commence in 2014. The link is scheduled to open to traffic in 2021.

More on this project




Learn more about immersed tunnels

Visualisation of the immersed tunnel under Fehmarnbelt
Immersed tunnels

Ramboll is main consultant on Fehmarn belt, one of the world's biggest projects with immersed tunnels. Read more about how we solve this and other world class immersed tunnels projects.

Immersed tunnels
Logo of Femern AS
Femern Belt

Visit Femern Sund Bælt's website to read more background about the project and see their many videos and visualisations.


NCE International Tunnelling Award

At the recent International Tunnelling Awards 2013, a team of innovative experts from Ramboll won the “Ground Investigation and Monitoring Award” for the "exceptional geotechnical consultancy work" on the Fehmarn Fixed Link project.

NCE International Tunnelling Award

Susanne Kalmar Pedersen
Senior Project Director
Tel+45 5161 6243