By the 1980s he believed he had discovered a secret underground base near Dulce populated by grey aliens and humans .
Starting in 1979 , Bennewitz became convinced he was intercepting electronic communications from alien spacecraft and installations outside of Albuquerque .
By the 1980s Bennewitz believed Bennewitz had discovered a secret underground base near Dulce populated by grey aliens and humans .
Starting in 1979 , Bennewitz became convinced he was intercepting electronic communications from alien spacecraft and installations outside of Albuquerque .