I think I know, where they got the idea for the X Files. Because every alien episode takes place in Roswell, Area 51 was also in the X Files and the FBI was involved. That is everything that was mentioned in the Roswell incident
There are many reports of underground bases reported around the world. A comprehensive list can be found here compiled by Bibliotecapleyades and another list can be found here compiled by UFO-Aliens. New York City There is an entrance to the.