[teepo]

Found this at least [1]: "In 2010, as part of the ongoing Luna Reconnaissance Orbiter (LRO) NASA mission, the Miniature Radio-Frequency (Mini-RF) instrument acquired data that included a pit in Mare Tranquilitatis,” said Professor Lorenzo Bruzzone in a statement. “Years later we have reanalysed these data with complex signal processing techniques we have recently developed, and have discovered radar reflections from the area of the pit that are best explained by an underground cave conduit. This discovery provides the first direct evidence of an accessible lava tube under the surface of the Moon."

[1] https://www.iflscience.com/the-first-cave-has-been-found-on-...

[jvanderbot]

I can't help but think of the Moon is a Harsh Mistress every time I hear this news.

[kibwen]

I think it sounds more like The Lotus Caves: https://en.wikipedia.org/wiki/The_Lotus_Caves

[pndy]

There ain't no such thing as a free caves!

[dylan604]

So we're now saying the specific type of cheese that the moon is made from is Swiss?

[dunham]

It's Wensleydale, as documented in "A Grand Day Out".

[tailspin2019]

That documentary was full of holes.

[klyrs]

This has long been suspected due to the spheroidal indentations in the lunar surface.

[madaxe_again]

This is a remnant of the Great Fondue period shortly after the moon’s creation.

[mcswell]

Yes, but who cut the cheese?

[CapeTheory]

That would be the vending machine on the skis.