I'm trying to recall the title of an old teen-market book (circa late 60's to early 70s)

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I read it around the same time as Madeline L'Engels Wrinkle in Time, so early 70s? I suspect the book was written in the late 60s. It was probably 150-page paperback.

It takes place on a moon colony, and a boy (and I'm thinking also a girl) are travelling outside the colony when their rover falls into a crater or something and they end up being underground (in the moon). Down there they find fascinating caves, lots of luminosity to help see with, and much more than I recall.

Does that strike a chord with anyone?

[phantom power]

1. Does it include a robot that gets a 'color vision tube'?

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2. Don't recall

Main memory is of the moon buggy outside the colony, then falling into a crater/hole, and I think they could breathe down there (somehow) and luminous moss all over, and caves to explore, maybe a river (don't recall).

[phantom power]

3. Hmm. Even *if* it's the one I'm thinking of, I don't remember either.

[Babel_17]

4. I thought "Moon of Mutiny" but it looks different

https://en.wikipedia.org/wiki/Moon_of_Mutiny

[Babel_17]

5. Maybe The Trouble With Tycho?

Briefly, the trouble is that humans keep mysteriously vanishing in Tycho Crater. Prospector Chris Jackson meets Amelia Thompson. Amelia has the map to a big strike in Tycho, but she has a passel of legal troubles and needs Chris's help. In the meantime, Chris's backers on Earth have "rented out" their shares to a third party, one Chandler Brill, who spells trouble with a capital T. There is further hugger-mugger with various life-forms on Luna, some deadly and some friendly.

http://www.amazon.com/Trouble-Tycho-Bring-Back-Yesterday/dp/B004QCXHPS

https://www.blackgate.com/2014/02/23/vintage-treasures-the-trouble-with-tycho-by-clifford-d-simak-bring-back-yesterday-by-a-bertram-chandler/

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6. No. that wasn't it. but I ran it through Amazon looking

for "people who ordered this also orderd..."

but I'm not finding the novel.

I agree it's unordinary, along the way of a Madeline L'Engel novel (rough time frame). Can't nail it down, however.

[Babel_17]

7. Best of luck, and of course if ...

Best of luck, and of course if I stumble on any other possibilities, I'll post that here.

I read a lot of those juveniles/young adults.