Maybe this city wasn't created to be a city like what you're saying, though? Kind of like a...erm, camp, or temporary colony or stop point or something. And once they're done with one group of people, they'll just send them back and get another group of people if they need to. I don't really know, I'm just guessing out loud, really.

[He looks slightly incredulous at that next part, though.] Then what is the name of the system that brought us here, then?