They were the biggest fires in American history, in the tallest buildings in the world.
The firefighters who entered the Twin Towers on 11 September 2001 could only guess at what was happening almost 1000 feet above them.
Jose Torero believes new technology could have saved many of the 343 fire fighters who died doing their duty that day.
He believes he could even have saved the Twin Towers.
Set against the heroism of the day, Horizon examines the remarkable vision of one man who believes that the lessons of 9/11 have still not been learned, and that the safety of skyscrapers around the world is still fundamentally at risk.
Broadcaster: BBC Two
TX Date: April 2007
Total Episodes: 1
Duration: 50 mins
Executive Producer(s): Colin Cameron
Useful Links: BBC Two