The Insane Scale of Europes New Mega-Tunnel

A once-in-a-generation construction project is set to transform travel between central Europe and Scandinavia. When completed in 2029, the $8 billion Fehmarnbelt tunnel will be both the longest combined road and rail tunnel and the longest immersed tunnel anywhere in the world.

The Fehmarn Belt fixed link (Danish: Femern Bælt-forbindelsen, German: Fehmarnbelt-Querung) or Fehmarn Belt tunnel is an under-construction immersed tunnel, which will connect the Danish island of Lolland with the German island of Fehmarn, crossing the 18-kilometre-wide (11 mi) Fehmarn Belt in the Baltic Sea.