a) England and France
b) Sweden and Denmark
c) Switzerland and Italy
d) Denmark and Germany
Construction for the world’s longest immersed tunnel is underway. Slated to open to the public in 2029, the Fehmarnbelt Tunnel will connect the 11.1 miles of Baltic Sea between Denmark and Germany. Connecting the German island of Fehmarn and the Danish island of Lolland across the Fehmarn Belt, it will be the longest combined road and rail tunnel in the world.