Episodes

10 episodes in this season

Now Playing

Tunnel

50 min

Submarine

50 min

Aircraft

50 min

Oil Rig

50 min

Sky Wheel

50 min

Space Station

50 min

Dam

50 min

Cruise Ship

50 min

Dome

50 min

E10

Telescope

50 min

Big, Bigger, Biggest

TV Series

200850m6.8

Documentary

Now playing

Tunnel

Season 2 · Episode 1 · Jul 28, 2009

Unearth the technological leaps forward that have allowed the world's longest tunnel - the Gotthard Base Tunnel - to be built. The Gotthard Base Tunnel stretches 57 kilometres through the heart of the Swiss Alps. It is deeper than any other tunnel on Earth and paves the way for a vital high-speed rail link between Zurich and Milan. 2000 workers and four gigantic tunnel boring machines work flat-out to excavate 24 million tonnes of mountain rock to complete the tunnel. Explore how this structure was made possible through a series of six engineering breakthroughs. See how six landmark tunnels - including the Thames Tunnel and Channel Tunnel - each feature an ingenious technological innovation that have enabled tunnels to grow ever longer.

More details

Big, Bigger, Biggest

TV Series

200850m6.8

Documentary

Now playing

Tunnel

Season 2 · Episode 1 · Jul 28, 2009

More details