Message posted by GaBRiel (Member since 11/10/2007) on August 02, 2022 at 22:06:04 PST:
It is a hush house used for testing aircraft engines and other systems.
Similar facilities can be seen at Nellis AFB:
In Reply to: Strange Hangar/Shelter at Area 51 posted by Owen Hamilton on August 02, 2022 at 21:37:19 PST:
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