So, in my 1.8 playthrough, there were alien ruins on Ganymede. I created three Ground forces with 10 XA vehicles each, created a colony, and waited for them to translate the alien language.
Years passed. No dice. I was confused.
So, after about a decade, I create two ground forces with 10 construction vehicles each, and dropped them on Ganymede. Literally in the same 30-day increment in which they were dropped, I get the ruins exploited event.
I guess there's a small chance this is pure luck, or I've completely misunderstood the new rules. I _thought_ the idea was that now, XA was used to translate their language and get a sense for what the installations were, and Construction was for actually reclaiming said structures. But the behavior makes me think I need both to see any progress with alien ruins.