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Underwater Lego Blocks Build 11-Mile Sea Tunnel
6 Mar
Summary
- An 18km immersed tunnel connects Denmark and Germany beneath the Baltic Sea.
- The project utilizes giant, prefabricated concrete sections assembled underwater.
- Expected to open in 2029, reducing travel times significantly between countries.
A groundbreaking immersed tunnel, set to become one of the world's longest, is nearing completion beneath the Baltic Sea. This 18-kilometer structure will directly link the Danish island of Lolland with the German island of Fehmarn, significantly transforming travel between the two nations.
The Fehmarnbelt Tunnel, anticipated to open in 2029, is being constructed using massive, prefabricated concrete elements. These colossal sections, each weighing up to 73,500 tons, are towed into position and carefully assembled in a prepared seabed trench. This innovative immersed tunnel technique avoids disrupting busy maritime shipping lanes above.
This engineering marvel is projected to slash journey times dramatically. The current 45-minute ferry crossing will be replaced by a 10-minute drive, and train journeys between Copenhagen and Hamburg could be shortened by approximately two hours. The project, costing around €7.4 billion, is primarily funded by Denmark, with additional support from the European Union.
Safety systems within the tunnel are designed to meet or exceed stringent modern standards. These include continuous emergency lanes, advanced surveillance, and robust ventilation controls. The tunnel will accommodate both a four-lane highway and a double-track electrified railway, functioning as a vital artery for Scandinavia and central Europe's transport network.
