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Someone is trying to do something like this on a smaller scale. But you could do better. Construction Thankfully 50 meters isn't all that far down, so while it will take some heavy duty construc...
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#1: Attribution notice removed
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System
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2021-03-30T23:53:14Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/14690 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/