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Q&A How could an alien mine exist under a planet's surface without humans detecting it from above?

Imagine a human observation and research facility being built on a planet in a distant solar system. How could an alien colony exist beneath the planet's surface, staying completely invisible to h...

5 answers  ·  posted 6y ago by unfa‭  ·  last activity 6y ago by unfa‭

Question technology science-fiction mining stealth