Well, that's kinda complicated. Sometimes Acumen... loses people. Like, they leave the dome, but we don't really know why or where they go. They usually come back, though.
... and I know that sounds really scary, but no one's ever come back hurt or different or anything, so I don't think they go anywhere bad. But no one really gets how it works.
It's pretty big. There's a map in your pamphlet and one you can bring up on the headset, and they show the whole layout. It's in sectors, with Sector 0 and the clock tower right in the middle.
[Pause.] This is probably a lot to take in, huh? Just stop me if I'm telling you too much at once.