Tehachapi, California
Tehachapi (also referred to as Tahon or Tejon Ranch by UFO researchers) is a region in Kern County, California, in the Antelope Valley area near Edwards Air Force Base. The Tehachapi Mountains house a Northrop Grumman radar cross-section (RCS) test range and an alleged underground facility that has been linked by multiple sources to UFO legacy program operations.
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Tehachapi Triangle
In the spring of 1992, forensic illustrator Bill McDonald met with four engineers — two from Northrop Grumman and two from Lockheed Martin — at a Denny's restaurant in Antelope Valley. The engineers, frustrated by extreme security impositions, described a triangular craft that residents had been reporting for years: the XF-131 Super Sentinel. The two Northrop employees worked at a facility called Tehachapi Ranch, while the two Lockheed employees worked for Ben Rich at Skunk Works and operated the radar cross-section range known as Helendale. McDonald produced a forensic illustration known as the "Tehachapi Triangle 1992" based on their testimony.
McDonald claimed the facility was alleged to be part of Antelope Valley's network of legacy program operations, alongside Helendale and Edwards AFB.
Underground Facility Claims
The Tehachapi Ranch facility is alleged to house an extensive underground complex known as the Anthill. Informants compiled by Bill Hamilton claimed tunnels beneath the facility featured round doorways with red and green entry lights, and that on-site personnel rotated every 14–16 days. A source who claimed to work on "Project Star Talk" at the facility described a large underground building using lasers to interact with or "bring in" UAP using scalar technology. A local property owner on 170th Street west of Tehachapi reportedly witnessed the ground opening like a missile silo from which a flying saucer emerged; Edwards AFB OSI personnel allegedly silenced this witness.
Bill Hamilton was deeply invested in the Tehachapi facility and compiled the largest body of firsthand testimony about its alleged underground operations. His assessment — corroborated by Richard Sauder's confirmation of an underground facility at the site through documentary research — was that the Tehachapi Anthill served as the primary underground node in a network of UFO legacy program facilities spanning the Antelope Valley.