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Underground caves do exist on the Moon, radar observations confirm
(www.techspot.com)
This is a most excellent place for technology news and articles.
This would be especially nice if water ice was discovered inside
I mean, lunar water exists...they just have to figure out if it flows when the moon faces the sun for 14 days at a time and gathers in these lava tunnels or stays in the form of beads
https://www.sciencealert.com/huge-amounts-of-water-on-the-moon-may-have-just-been-located