How Did Jet Fuel Melt The Steel Beams In The Twin Towers? | Blowing-Up History

When it was completed in 1973, the World Trade Centre was the tallest building in the world, thanks to many of its revolutionary construction methods. But none of these methods was enough to survive the attacks on September 11th where jet fuel fires led to a weakening of the steel that held the structure together, and ultimately caused both buildings to collapse. Subscribe to Discovery UK for more great clips: http://www.youtube.com/subscription_center?add_user=DiscoveryTV Follow Discovery UK on Twitter: http://www.twitter.com/DiscoveryUK