"Ah, well," he started, pondering a vague explanation. "Laboratories, for the most part, though some actually prefer to live in such environments. Civilizations evolve in such different ways. The comforts of one might be completely alien to another." The Doctor easily adapted as needed, but many others wouldn't, or couldn't. That had him pondering just how different this society would be to some of those waking up.

And, of course, his curiosity got the better of him, as he tilted his head to squint towards this fellow. "The world you... dreamed. You'd said there were familiar things, didn't you?"