Scientists discover fascinating tunnel, cave pit on the moon

 https://mashable.com/article/moon-caves-pits-shelter-astronauts

https://www.ign.com/articles/scientists-reveal-interior-of-lunar-opening-that-could-serve-as-a-moon-base-for-future-astronauts

https://science.nasa.gov/solar-system/new-evidence-adds-to-findings-hinting-at-network-of-caves-on-moon/

https://www.independent.co.uk/space/moon-tunnel-lunar-surface-cave-tube-b2580102.html

https://www.wired.com/story/moon-tunnels-caves-astronauts-moon-colony/