For decades, mysterious UFO sightings have raised questions about what governments really know—and what they may have kept secret. From Roswell and alleged crash-recovery programs to Project Blue Book and eyewitness accounts of unexplained encounters, investigators examine the history of official involvement with the UFO phenomenon. Then, newly revealed Pentagon investigations and extraordinary encounters involving U.S. military pilots bring the mystery into the modern era. Could some UFOs represent technology beyond our understanding, and how much does the government actually know? The UnXplained (S2, E4) investigates the evidence behind one of history's most enduring mysteries. #TheUnXplained New Episodes Fridays 9/8c Watch full episodes of The UnXplained and stay up to date on all of your favorite The HISTORY Channel shows at history.com/schedule. Check out more full episodes of The UnXplained on YouTube here- https://bit.ly/TheUnXplainedS5 and on Google Play! https://bit.ly/TheUnXplainedS5GooglePlay Subscribe for more from The UnXplained and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT Watch more The UnXplained on YouTube in this playlist: https://histv.co/UnXplainedYT Find out more about the show and watch full episodes on our site: https://histv.co/unxplained Check out exclusive The HISTORY Channel content: History Newsletter - https://histv.co/newsletter Website - https://histv.co/History Facebook - https://histv.co/Facebook Twitter - https://histv.co/Twitter From the producers of Ancient Aliens and The Curse of Oak Island comes The UnXplained, a one-hour, non-fiction series that explores the world’s most fascinating, strange and inexplicable mysteries. Hosted and executive produced by Golden Globe and Emmy Award-winning actor William Shatner (Star Trek, Boston Legal) each episode will feature compelling contributions from scientists, historians, witnesses and experiencers—each seeking to shed light on how the seemingly impossible actually can happen. HISTORY® is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.