Fehmarnbelt Fixed Link (Immersed Tube Tunnel)
Rødbyhavn / Puttgarden, Denmark, Europe
Under Construction · Transport · Immersed Tube Road And Rail Tunnel · Temperate
The world's longest immersed tube tunnel (18km) connecting Denmark and Germany, comprising 89 standardised concrete element segments each weighing 73,000 tonnes, cast in a purpose-built factory on the Danish coast and floated into position. Construction began 2021, expected completion 2029.
Innovation highlights
- world's longest immersed tube tunnel at 18km
- purpose-built coastal factory producing 89 standard tunnel elements
- 73,000-tonne segments floated and sunk with millimetre positioning accuracy
- combined road and rail bore in single cross-section
- seabed dredge-and-trench method adapted for Baltic geological conditions
- self-contained element joints designed for 120-year service life in saline environment
- Client / Developer
- Femern A/S (Danish state)
- Architect
- Dissing+Weitling (portal architecture)
- Engineer
- COWI / Rambøll / Arup (joint venture)
- Type
- Immersed Tube Road and Rail Tunnel
#immersed tube #tunnel #prefabrication #marine construction #transport infrastructure #mega-project
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