History Of Area 51 By Annie Jacobsen Tunnels 4500' deep https://www.youtube.com/watch?v=e9K4GptQ_po Patent for a nuclear tunnel boring machine Secretary of Defense visits secret base next to Area 51 Mysterious High-Altitude Flight Corridor Was Opened Up Between Area 51 And The Pacific Area 51’s New Hangar Facility Points To Drone Swarm Future Visitors To Area 51 Have To Wear …