Question

1) the longest underground tunnel in the world​

Answer 1

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The Gotthard Base Tunnel

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The Gotthard Base Tunnel is the world's longest and deepest tunnel. It runs under the Swiss alps between the towns of Erstfeld in the north and Bodio in the south. The tunnel is 57 km long and reaches a depth of 2,300 meters.

Answer 2

Answer:

The Gotthard Base Tunnel is the world's longest and deepest tunnel. It runs under the Swiss alps between the towns of Erstfeld in the north and Bodio in the south.