How much does the government actually know about UFO's? And how much of that knowledge are they hiding? Find out now as Kevin Day, Chief Radar Operator of the USS Princeton, discusses his haunting experiences with UFOs. Watch new episodes on Sundays at 9/8c on SHOWTIME. All episodes now ...

Check out the preview for Season 11 Episode 2 of Ancient Aliens, new episodes Fridays 9/8c Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show and watch full episodes on our site: http://po.st/AncientAliens Check ...