World's Longest Underwater Tunnel Unveiled

06 Sep 2023 CW Team

After 10 years of planning, construction began in 2020 on the Danish side and then in 2021 on the German side. For the tunnel, the European Union will contribute 鈧�1.1 billion towards the project. It will be put together 40 metres below the Baltic Sea using 89 massive concrete sections. These will be pre-built on land and then lowered into the water using a crane. Femern A/S, the state-owned Danish company in charge of the project, hopes that it will be ready to immerse the first of these sections by 2024. Once they are in place, the concrete sections will be fitted together and other elements like railway tracks, ventilation and cameras will be installed. Some environmental groups questioned the impact of the tunnel on wildlife in the Fehmarnbelt - an EU protected area. But Fermern A/S says the tunnel will 鈥渋ncrease capacity and relieve congestion on the rail and road networks in Denmark鈥�. The company also claims it will lead to 鈥渟ignificant鈥� savings in time, energy, fuel and CO2 emissions.

The first tunnel element is expected to be immersed in the Fehmarnbelt in 2024 in the special tunnel trench, which is currently being dredged. Over 90 per cent of the dredging operations have now been completed and the Fehmarnbelt link will open in 2029.

In a remarkable engineering feat, the world's longest (18 km) rail and road underwater tunnel, which will connect Denmark (R酶dbyhavn) and Puttgarden on the German island of Femern by 2029 has been unveiled. The tunnel, officially called the Fehmarnbelt Fixed Link and designed for a minimum lifespan of 120 years, will have two double-lane motorways and two electrified rail tracks. When the 鈧�10 billion Fehmarnbelt tunnel, which is being constructed on the basis of a design philosophy called 鈥榙esign and build鈥� is completed, it will cut travel time down to 10 minutes by car and seven minutes by train from R酶dbyhavn to Puttgarden, a crossing that now takes 45 minutes by ferry, also avoiding a 160 km detour across the Danish mainland. Rail travel times from Hamburg in Germany to Copenhagen in Demark will be cut from around five hours to less than three. Road users and train passengers will save about one hour each way compared to the ferry crossing. The link will be open 24 hours a day as a tunnel is not affected by wind or weather.After 10 years of planning, construction began in 2020 on the Danish side and then in 2021 on the German side. For the tunnel, the European Union will contribute 鈧�1.1 billion towards the project. It will be put together 40 metres below the Baltic Sea using 89 massive concrete sections. These will be pre-built on land and then lowered into the water using a crane. Femern A/S, the state-owned Danish company in charge of the project, hopes that it will be ready to immerse the first of these sections by 2024. Once they are in place, the concrete sections will be fitted together and other elements like railway tracks, ventilation and cameras will be installed. Some environmental groups questioned the impact of the tunnel on wildlife in the Fehmarnbelt - an EU protected area. But Fermern A/S says the tunnel will 鈥渋ncrease capacity and relieve congestion on the rail and road networks in Denmark鈥�. The company also claims it will lead to 鈥渟ignificant鈥� savings in time, energy, fuel and CO2 emissions.The first tunnel element is expected to be immersed in the Fehmarnbelt in 2024 in the special tunnel trench, which is currently being dredged. Over 90 per cent of the dredging operations have now been completed and the Fehmarnbelt link will open in 2029.

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