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During the construction phase from 2015 to 2021, there will be many phases and activities. The most significant milestone will be the arrival and start of the Tunnel Boring Machines. The TBMs will arrive from the factory in the spring 2016 and be assembled in the tunnelsystem in the mountain. In the autumn 2016 they will start drilling, two towards Oslo and two towards Ski.

In about two years the machines will have completed their drilling, and the next phase of the project begins. This includes installation of different systems and tracks. The tunnel should be finished in 2021.






Excavate assembly hall and transport tunnels. Drill and blast.

Segment production

Concrete factory on site. Produce segments, transported to tunnels.

TBM Assembly

Underground TBM assembly. Transporting parts, use gantry crane to mount.

Tunnel boring

Four TBMs to excavate two parallell tunnels. Start from site at ├ůsland in Oslo

Lining of tunnel

Creating a strong and smooth wall

Railway systems

Installation of railway systems

Finished tunnel

Scandinavia's longest railway tunnel. Ready for use in 2021!