dcsimg Immersed tunnels - Ramboll Group

Immersed tunnels

The immersed tunnel (or immersed tube) is a tunnel construction method commonly used for crossing a body of shallow water. The method has been widely used for about 100 years, and more than 150 immersed tunnels have been constructed worldwide. They mainly serve as road or rail tunnels, but immersed tunnels are also used for water supply and electric cables. Ramboll provided professional services to a wide range of immersed tunnels worldwide. 


Ramboll possesses the know-how and experience within all relevant technical fields related to immersed tunnels, for all stages from the early studies and planning to the detailed design. We also assist our clients with construction follow-up, supervision, independent checking and maintenance.

In the capability statement you can read more about the immersed tunnel techniques and services provided by Ramboll. The capability statement can be downloaded at the end of this page.

The Fehmarn Belt immersed tunnel will be the longest tunnel yet to be designed in accordance with EU Directive 2004/54/EC on road tunnel safety and will set new standards for modern tunnel design.

More information about immersed tunnels


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


Øresundsbron AS is the company for the combined immersed tunnel and bridge crossing between Denmark and Sweden.



Tunnel engineering brochure - click to read PDF
Tunnel Engineering brochure

Tunnel Engineering brochure (PDF, 1 MB)
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


Immersed tunnels brochure - click to read PDF
Immersed tunnels capability statement

Immersed tunnels brochure (PDF, 5.8 MB)


Susanne Kalmar Pedersen
Susanne Kalmar Pedersen
Project Director
T+45 5161 6243