Why They Are Here (S17E04)

S17E01 Entering Area 51 S17E02 Building and Destroying Pitholem S17E03 Theory of Time Travel S17E04 Why They Are Here S17E05 Decline of NASA S17E06 Behind the Missions: David Adair S17E07 Alien Abduction Programs S17E08 Threats to Our Electrical Grid