You may have seen trains running on land, over bridges, or even above the sea. You might have watched a train disappear into a short tunnel. But imagine a train entering a tunnel and coming out only after traveling 57 kilometers. This is the reality of the Gotthard Rail Tunnel, the world’s longest and deepest railway tunnel.

The Gotthard Base Tunnel in Switzerland is a remarkable engineering achievement. It took 17 years to complete and required the hard work of 2,400 to 2,600 workers who worked day and night. The tunnel was finally opened in 2016.

This massive tunnel runs beneath the Swiss Alps and connects northern and southern Europe. It has reduced the travel time between Zurich and Milan from 5-5.5 hours to just 3 hours. Building it was extremely challenging; engineers had to remove

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