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Little do we know, there are five of them in existence already, by several ancient civilizations :)

I kid, but the more secure a vault is the more irretrievable it is, which only makes it useful to aliens, not us.




I remember reading a worldbuilding stack exchange question about what would be left of mankind in millions of years, were we to disappear today.

The unanimous response was "not much". Mostly anomalously concentrated resources. So... if they are right, even though we have no reason to believe there was a developed civilization before us, it's not that crazy to merely entertain the possibility.




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