Wouldn't they be in a different area? That's kind of how I imagined it, when Rei told me.

[ she picks up a stick and draws something on the ground. ]

The dark part of the colony is where we are. This is where the loud noises were likely coming from.

This is where the ghosts are, and that's where they came from, and where they've been sealed.

And this is the colony proper. I thought this was how it was, unless my understanding is completely wrong.