What, no caverns yet?
Apparently the first cavern layer is below -100 z. I walled it off for now, we have enough food, wood, booze and fatalities for now
I might set up a GCS capturing operation, though.
...Wow...
So, maybe move the hospital (and perhaps whole fort?) down nearer the caverns later, so you can have wells from an infinite water source? Or at least near a big cistern filled from the caverns? Infinite unfrozen water...
I collapsed quite a huge chunk of ice into the warmer layers. With booze production going without hiccups, I doubt water scarcity will be an issue in the next 100 years.
Well, that's only a century to relocate the entire fortress! Better get the miners started...
Besides, the new fortress should have better central planning and such.