UFOs: Investigating the Unknown

Last year, the US government passed legislation mandating an official investigation into UFOs. This provocative five-part series unspools the history leading up to this momentous change and reports on recent developments. It explores what the government made public versus what was kept hidden; citizens' push for transparency while confronting mass UFO sightings; Navy pilots' reports of unexplainable technology; new cutting-edge scientific efforts; and what the future might hold for this confounding mystery which is the focus of a deepening and expanding search for answers. (National Geographic)