This documentary deals with the attack on the World Trade Center on September 11th in 2001. The two brothers and filmmakers Jules and Gedeon Naudet originally were filming a documentary about a firefighter in New York, when the two planes hit the World Trade Center. The two filmmakers followed the firefighters to the scene. They were filming inside the buildings, when parts of them crashed down. This film is the only known footage from inside the Twin Towers on the day of the catastrophe.