Unidentified: Inside America's UFO Investigation S02E02 - The Triangle Mystery

Former intelligence officer Chris Mellon spearheads an investigation into one of the UFO phenomenon's great mysteries. Giant triangles allegedly capable of incredible acceleration and speeds have been seen all over the world, and even near major American cities. The lingering mystery: What are these objects, and what is their purpose. A new eyewitness may provide the answer: Are triangles mapping the surface of the earth, and for what purpose. Mellon and the team come to a headline-making conclusion.