Top best answers to the question «Which country has underwater tunnel»
Road. Rogfast tunnel in Norway – construction having started in 2018, at 27 km length, 392 m depth, it will be the longest road tunnel and deepest undersea tunnel in the world.
Japan's 53.85km Seikan railway tunnel passes beneath the Tsugaru Strait and connects the Aomori Prefecture on Honshu Island and the Hokkaido Island. With its track located 140m below the seabed, the Seikan tunnel is the world's deepest and longest railway tunnel.
The underwater tunnel connecting Denmark to Sweden is in fact the world's longest one used for rail and road transport, extending for over 8 km. Even more astonishing than the length is its cleverness. This underground tunnel is in fact part of the large Øresund bridge that connects Copenhagen to Malmö.