
Denmark and Germany now building the world's longest immersed tunnel
CNN
Descending up to 40 meters beneath the Baltic Sea, the world's longest immersed tunnel will link Denmark and Germany, slashing journey times between the two countries when it opens in 2029.
(CNN) — Descending up to 40 meters beneath the Baltic Sea, the world's longest immersed tunnel will link Denmark and Germany, slashing journey times between the two countries when it opens in 2029.
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.
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