A sculptural landmark revealing Europe’s longest immersed tunnel construction
Pilen (the Arrow)
Pilen is a striking 217 metre long viewing platform overlooking the emerging Fehmarnbelt tunnel between Denmark and Germany. Created to open up this landmark infrastructure project to the public, it offers an immersive window into construction in action while inspiring future engineers. Arup led the architectural vision and supported the client from early concept through to integrated design and delivery.
Shaped as a bold arrow pointing towards Germany, Pilen offers a unique vantage point on construction of the world’s longest immersed road and rail tunnel. Matching the 217-metre length of a tunnel segment, its timber deck and landscaped ramp rise 24 metres above sea level. Inspired by the coastal landscape, the fully accessible pathway leads visitors to sweeping views of the Fehmarnbelt Fixed Link, an 18km-long tunnel set to revolutionise transport between Scandinavia and continental Europe. Built from landfill and timber, incorporating local vegetation and designed for disassembly, it showcases low‑carbon alternatives to traditional tower structures.
Since opening in March 2025, the project has welcomed more than 100,000 visitors, quickly becoming a destination in its own right. Its impact is now recognised beyond the site too, with Pilen featured in LEGOLAND as a permanent part of their exhibition.
Pilen allows views of the Femern construction activities while providing a great experience for visitors. Image © Rasmus Hjortshøj
The geometry creates a dramatic and playful setting, while the gentle gradient keeps it accessible for all. Image © Rasmus Hjortshøj
The length of the tower is 217 meters – the same as just one of the tunnel elements. This, along with the impressive cantilevering tip tells the story of a technological achievement. Image © Rasmus Hjortshøj
The tower gradually elevates the existing landscape, providing views to the local context along the way. Image © Rasmus Hjortshøj
The structure celebrates engineering innovation and is in tone with the landscape of Lolland. Image © Rasmus Hjortshøj
The tower provides a wide area serving as a gathering and meeting point, as well as a pointed and lit tip that serves as a beacon. Image © Rasmus Hjortshøj
Not only does Pilen offer a superb overview, it also provides a great insight into the many different types of training that a world-class construction project requires to achieve its goal. A visit here will therefore fascinate and inspire children and young people to opt for professional training within the construction sector.
Pilen is featured in LEGOLAND as a permanent exhibit. Image © Sund & Bælt
Top image © Rasmus Hjortshøj
Explore our work on the Fehmarnbelt tunnel
Ramboll / TEC
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