Underground caves do exist on the Moon, radar observations confirm
Underground caves do exist on the Moon, radar observations confirm
https://www.techspot.com/news/103833-underground-caves-do-exist-moon-radar-observations-confirm.html
A new study published in Nature proposes the first true evidence of an "accessible cave conduit" on the Moon, located beneath the Mare Tranquillitatis pit. A future...
"Permanent lunar colonies could soon become an attainable target for space agencies"