The Fehmarnbelt Tunnel, a project in progress that might be finished in 2029, has the potential to be the longest underwater tunnel for automobiles in both Europe and the world, measuring over 18 kilometers in size. Additionally, it is anticipated to pass between Fehmarn and Lolland, connecting Germany and Denmark.

The new structure will make it possible to travel between the two nations using personal cars and trains, breaking the ferry's unique status as a mode of transportation.

At the seafloor, material sections will be used to construct the underground tunnel.

Development began four years ago, and it stands out for both the size and the building process chosen for it. This system is not being excavated using a tunnel boring machine beneath the ocean, unlike other well-known underground caverns, like the Channel Tunnel, which connects France and the United Kingdom.

Otherwise, the engineers chose a method known as submerged drilling, Motor Pasion claims. This method involves placing huge amounts of concrete on the ocean after making them large sections on land. The pipe will have 89 sections, each measuring 217 meters long and weighing 73, 000 tons complete. Two electric railroad tracks, two road lanes, and a maintenance and security service corridor are all present in each of these sections. The flow of transportation between Germany and Denmark is improved by the design, which allows both trains and vehicles to go at once. The Fehmarnbelt Tunnel, which is being constructed at a level of up to 40 feet below sea level, is being constructed. This degree prevents maritime navigation from being impeded by interference with the structure's stability. They are also constructing the deepest rail system in Latin America, with terminals 65 feet underground. The final product will have a significant effect on travel times once it is finished. In either a car or a coach, the journey will take about 45 minutes, or 45 minutes, nowadays, by ferry. This will make it easier for people and goods to move around, boosting both the two nations ' economic and social relations. The material sections are produced in a Danish factory with extraordinary dimensions. When finished, they are both secured and transported by water to their last location using tugboats. One of the project's most delicate phases begins it: the controlled falling of each section into an 18-kilometer trench that was recently excavated on the seabed. The various components are crafted to suit exactly in millimeters between the various processes.

The project's estimated cost is approximately$ 7 billion ( more than$ 8 billion ), which the authorities believe is strategic.

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