What is the Longest Deepest Tunnel in the World? (Gotthard Base Tunnel)

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The Gotthard Base Tunnel stretches 35.5 miles (57.5 km) under the Alps in Switzerland. Completed in 2016 after a nearly 20 years of construction, the tunnel overtook the Seikan Tunnel in Japan as the longest in the world.

Aside from being the longest underground tunnel in the world, it is also the deepest ever constructed. Part of the tunnel bores under Piz Vatgira, a nearly 10,000-foot tall mountain in the Swiss Alps. Underneath the peak of this mountain, the tunnel sits 1.42 miles (2.3 km) underneath the surface. That equates to 1.5 times the deepest point in the Grand Canyon, all sitting over the heads of the passengers on the high-speed trains that travel through the tunnel.

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