Denmark is building the world’s longest underwater rail and road tunnel, the Fehmarn Belt.
The Danish state-owned company Sund & Bælt is implementing one of the largest infrastructure projects in Northern Europe — the Fehmarn Belt underwater tunnel, which will connect the city of Rødby on the island of Lolland with the German Putgarten. When completed in 2029, it will be the longest combined tunnel for cars and trains in the world — 18 kilometers along the bottom of the Baltic Sea. It will become a new high-speed alternative to the ferry service between Denmark and Germany.
