9/11 Conspiracy Files: The Third Tower delves into one of mysteries surrounding Sept. 11th, a third tower at the World Trade Centre, which along with the Twin Towers, collapsed on that fateful day. But this skyscraper was never hit by a plane. This 47-story tower fell seven hours after the others and has become the subject of heated speculation and conspiracy theories largely fuelled by the internet. 9/11 was the first global event in the age of the worldwide web and it’s being used as a platform for a wide range of conspiracy theories — more than 50 at the last count — that allege that the U.S. government was somehow involved in the attacks on the World Trade Centre and the Pentagon.