Gotthard Base Tunnel

The Gotthard Base Tunnel (GBT) is a railway tunnel beneath the Alps in Switzerland. With a length 57 km (35.4 mi) and a total 151.84 km (94.3 mi) tunnels, shafts and passages, it is the world's longest rail tunnel, surpassing the undersea Seikan Tunnel in Japan.
The project consists two single track tunnels. It's part the AlpTransit project, also known as the New Railway Link through the Alps (NRLA), which also includes the Lötschberg Base Tunnel between the cantons Bern and Valais. It bypasses the 19th century Gotthardbahn, a winding mountain route across the Saint-Gotthard Massif, and establishes a direct route usable by high-speed rail and heavy freight trains.
After 64 percent Swiss voters accepted the AlpTransit project in a 1992 referendum, construction the tunnel began in 1996. Boring operations in the east tunnel were completed on 15 October 2010 in a cut-through ceremony broadcast live on Swiss TV. When it opens for traffic in late 2017, the tunnel will cut the 3.5-hour travel time from Zürich to Milan by an hour and from Zürich to Lugano to 1 hour 40 minutes.