The World's Most Extreme: Tunnels
Channel 4
Tuesday 7 June 2022 01:50 - 02:45 (55 mins)
From the 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. [S,SL]
The World's Most Extreme: Tunnels may be available on playback
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