What caused Building 7 to collapse on 9/11? Dr. Leroy Hulsey from the University of Alaska Fairbanks may have the answer, following an exhausting four year engineering study.

Cast:Roland Angle, Leroy Hulsey, Ed Asner, Kamal Obeid, Scott Grainer,

Genre:Documentary,

country:United States of America,

Production:The Orchard, 1091 Pictures,