Question : The world's largest and deepest rail tunnel Gotthard Base tunnel is located in which country?
Option 1: Belgium
Option 2: Austria
Option 3: Switzerland
Option 4: Sweden
Correct Answer: Switzerland
Solution : The correct option is Switzerland .
Switzerland is home to Gotthard Base, the longest tunnel in the world. From Erstfeld in the north to Bodio in the south, it passes beneath the Swiss Alps. With a depth of 2,300 meters, the tunnel is 57 kilometres long. It was a part of the AlpTransit project, also known as the New Railway Link through the Alps (NRLA), constructed in 17 years.
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