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World’s Most Extreme: 1x6
Tunnels
From the Swiss Alps to a Japanese metropolis, tunnels are often wonders of modern construction, but can also be scenes of disaster. These are the 10 most extreme tunnels on Earth.
From the Swiss Alps to a Japanese metropolis, tunnels are often wonders of modern construction, but can also be scenes of disaster. These are the 10 most extreme tunnels on Earth.
