Alien Caves
Mountains
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Source: Wiki Commons
Mountains

Antarctic
- Admiral Richard E Byrd and the Hollow Earth
Admiral Byrd reported he had been kidnapped in Antarctica. His story sparked a now increasing "Hollow Earth" theory. - The Real Hollow Earth
Even if the hollow earth theory is not correct, it doesn't mean that underground civilizations do not exist. Are they a possible future threat?
UFOs
Antarctic Cave
- Aldebaran - Nazi - N.A.S.A. Pt. 1
Is it possible that some of our technology was learned from aliens? Pt 1, suggests the link from Alpha Tauri to the Nazis. - Underground Civilizations: No Myth
For many years stories of ancient civilizations living underground was thought a mere myth. Now underground cities are being excavated, is there truth to the myths? - Outer Space Beneath Our Feet
Many very large caves have been found. There must be many more yet undiscovered. Is it possible that a whole civilization could be living underground?
