Denmark and Germany Now Building the World's Longest Immersed Tunnel
After more than a decade of planning, construction started on the Fehmarnbelt Tunnel in 2020 and in the months since a temporary harbor has been completed on the Danish side. It will host the factory that will soon build the 89 massive concrete sections that will make up the tunnel. "The expectation is that the first production line will be ready around the end of the year, or beginning of next year," said Henrik Vincentsen, CEO of Femern A/S, the state-owned Danish company in charge of the project. "By the beginning of 2024 we have to be ready to immerse the first tunnel element."
The tunnel, which will be 18 kilometers (11.1 miles) long, is one of Europe's largest infrastructure projects, with a construction budget of over 7 billion euros ($7.1 billion). [...] It will be built across the Fehmarn Belt, a strait between the German island of Fehmarn and the Danish island of Lolland, and is designed as an alternative to the current ferry service from Rodby and Puttgarden, which carries millions of passengers every year. Where the crossing now takes 45 minutes by ferry, it will take just seven minutes by train and 10 minutes by car. The tunnel, whose official name is Fehmarnbelt Fixed Link, will also be the longest combined road and rail tunnel anywhere in the world. It will comprise two double-lane motorways -- separated by a service passageway -- and two electrified rail tracks.
