The European Space Agency has proposed that it’s possible to build bases in gigantic tunnels buried beneath the moon’s surface. It’s issued an open call for ideas on how to ‘design a system to detect, map and explore caves on the Moon.
https://metro.co.uk/2019/08/22/european-space-agency-wants-build-underground-bases-moon-10615884/
cover tunnel photo by: Matt Brown from London, England / CC BY
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