Yes, but it was not a secret-people have been talking about it for years. Of course they were just called conspiracy nuts.
Was link deleted by MemoryHole, Inc.?
Anyone get it cached?
https://thechive.com/2012/03/08/something-is-rotten-in-the-denver-airport-25-photos/
Wikipedia description from the 1998 movie Deep Impact “Beck then imposes martial law and reveals that governments worldwide have been building underground shelters. The United States’ shelter is in the limestone caves of Missouri. A lottery selects 800,000 Americans under age 50 to join 200,000 selected individuals, as well as a massive supply of food, genetically viable populations of significant animals, and the seeds of every plant species”