An XXL scale Lego submarine.
It is precisely in the land of the giant of children's beloved bricks, Denmark, that the construction of the longest submerged tunnel in the world begins on Friday.
17.6 kilometers long, it will link Denmark to Germany, between Rodbyhavn, a town in the south of the island of Zealand, where the Danish capital is located, Copenhagen, and Puttgarden, in Schleswig-Holstein.
The two countries have a land border, but the new structure will avoid a detour of 160 kilometers through the Danish region of Jylland or an hour by ferry.
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The French giant Vinci heads the consortium of ten companies working on this pharaonic project.
The technique adopted is not that of the huge tunnel boring machines that dig a tunnel, as was the case under the Channel or for the new railways linked to the Grand Paris Express, currently under construction.
The Danish authorities have opted for a set of concrete elements, which will be towed and then
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