Known as GBT, the world's longest railway and deepest traffic tunnel carves a 35.5 mile path through what mountain range?

The GBT is short for Gotthard Base Tunnel, and its main purpose is to increase the ability of freight to travel through the Alpine terrain in Switzerland. The tunnel has only been active since 2016, and during its construction, 9 workers lost their lives.

Asked by Tom Cohen · Last updated 5 years ago · 1.9K views