It's past the commune a ways on the edge of town. Having in the town itself seemed like a bad idea as building it involves a lot of digging and building.

I've got most of the underground structure dug and reinforced, and some of the brickwork done for the above ground building that will sit over the entrance... There's still a lot to do.

[He pauses and mutters softly to himself.]
Might have actually gotten farther in the construction if I'd remembered to actually tell others that it was being built...
[Despite the improvements he'd made in his behavior since he arrived, he was still used to having to do almost everything himself. Old habits were hard to break.]