No mining complexes - I gather the area isn't very mineral-rich - but there's been mention of a few subterranean storehouses and research facilities. Not much in the way of precise locations, but I'd be surprised if no one built into the mountains. It would be easier than keeping something on our level from flooding.

I've been doing some sifting through the restricted archives - I can see if there are some more precise records from the war in there. I don't know how much good it would do in the short term - between your trip and the group off hunting those monsters, there aren't that many adventurous sorts left in the city.