World's Most Extreme — Season 1, Episode 6: Tunnels
Documentary • 45 min • 2 seasons, 12 episodes • ★ 4.0/10
Episode synopsis
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.
About World's Most Extreme
World's Most Extreme takes you to the most jaw-dropping and extreme places anywhere in the world.