Watch Series: NASA's Unexplained Files Released in (2012) - Season 4 produced by USA, The TV Series categorized in Documentary, and content rating TV-G with duration 45 min broadcasted as these networks Science, Science Channel, Streamed at Putlocker & directed by Ian Levison, Simon Martin, Nick Patterson. Dive into the mysteries of some of NASA’s most curious missions and explore stories of engineering achievement and human endurance. Each episode offers first hand testimony from astronauts, NASA mission footage, plus beautifully rendered CGI to bring to life these voyages that reveal unexplained sightings that have dogged many of NASA’s most famous missions. - Season 4