I knew it. Allowing this migrant wave to partially enter the fortress was a bad idea. One of the metalcrafters in it decided he wasn't satisfied with the state of Hushgranite. Now I lost a smelter. Good thing I have enough iron to produce armour and weapons for my soon-to-be security squad.
The metal industry in Hushgranite is far superior to the industry in Darkmeadow. In Darkmeadow, I didn't have access to Gypsum, Bituminous Coal, or even any iron ores. I was forced to live off a badly equipped, easily wounded Dwarven military. With Hushgranite, I have access to huge clusters of Bituminous Coal and Magnetite, which I'm in the process of mining out. I've also made sure that the pets won't accidentally run into the danger room.
EDIT: Oh, up until now I only had one Metalsmith's Workshop. The other one kept getting suspended. Only now did I notice a piece of unclaimed coal was blocking one of the outer tiles.
EDIT2: WHAT! "Dobar Mondulalath, Metalcrafter cancels Drink: Dangerous Terrain" Somehow, water is now spewing up the well and is flooding the habitat level. I hope shutting the hatch will stop it from pumping into the fortress. If not... Well, one bath a year.
EDIT3: Phew, the emergency hatch worked. It stopped the flooding before anything could be damaged. The well is intact still, so I wonder what just happened.