At an amazing 35 miles, the world's longest and deepest tunnel burrows through what mountain range?

The Swiss Alps are home to the world's longest and deepest tunnel, the Gotthard Base Tunnel. Burrowing 8,000 feet into the Earth, the tunnel runs over 35 miles from the towns of Ertsfeld to Bodio and its construction displaced 31 million tons of rock, which is enough to comprise five Egyptian pyramids.

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