Geography, asked by bitupansaikia460, 10 months ago

what is the biggest tunnel in the world?

Answers

Answered by sinhanidhi716

Gotthard base tunnel

The world's longest and deepest rail tunnel has officially opened in Switzerland, after almost two decades of construction work. The 57km (35-mile) twin-bore Gotthard base tunnel will provide a high-speed rail link under the Swiss Alps between northern and southern Europe.

Answered by aakriti05

Answer:

Gotthard base tunnel

Explanation:

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