Summary of Bizarre secret CIA declassified file on lost ancient human civilizations

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The CIA has declassified a file discussing the possibility that ancient human civilizations may have vanished without a trace. The file discusses the possibility that these civilizations may have been destroyed by some unknown catastrophe, or that they may have simply disappeared.

• 00:00:00 This bizarre declassified CIA file discusses the possibility that ancient human civilizations may have vanished without a trace. The file discusses the possibility that these civilizations may have been destroyed by some unknown catastrophe, or that they may have simply disappeared.