Gotthard Base Tunnel, Switzerland
The Gotthard tunnel is the world’s longest and deepest rail tunnel. The Gotthard tunnel is 57 km (35 miles) long and is designed to provide a high-speed rail link from Rotterdam in the Netherlands to Genoa in Italy. The tunnel has helped to decrease the travel time between Zurich, Switzerland, and Milan, Italy, by an hour.
Seikan Tunnel, Japan
The Seikan tunnel is the world’s longest underwater railroad tunnel. Seikan tunnel is 33.5 miles (53.9 km) long is build to connect two japanse islands.
Channel Tunnel (English Tunnel) United Kingdom and France
Channel Tunnel is also called English Tunnel is 31.5 miles (50 km) long underwater tunnel. The tunnel runs between Folkestone in England and Pas-de-Calais in northern France and is used for both freight and passenger traffic.
Hakkoda Tunnel, Japan
The Hakkoda Tunnel is 16.4 miles (26.4 km) long railway tunnel located in central Aomori Prefecture, in the Tōhoku region of Japan. It passes through the Hakkōda mountain range and links the town of Shichinohe with the city of Aomori.
Lotschberg Base Tunnel, Switzerland
Lotschberg Base tunnel is 21.5 miles (34.6 km) long railway base tunnel cutting through the Bernese Alps of Switzerland. It runs between Frutigen, Berne, and Raron, Valais.