Gotthard Base Tunnel (GBT) 
The Gotthard Base Tunnel is the world’s longest and deepest railway tunnel, stretching an incredible 57.1 km beneath the Swiss Alps. This engineering masterpiece connects northern and southern Europe, dramatically reducing travel time while showcasing Switzerland’s innovation and precision.
Opened in 2016, the tunnel runs deep under the mountains, reaching depths of over 2,300 meters, and plays a vital role in sustainable transport by shifting freight from road to rail. A true symbol of human ingenuity carved through nature. 
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