World's Most Extreme

Season 1 Episode 6: 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.

Genre:

Documentary

Seasons:

2

Episodes:

12

Cast:

Quality:

HD

Duration:

45 min

First Air:

2014

Rating:

4.0