Does the Snapshot occupy real space?

Question

In Brandon Sanderson's novella Snapshot, the Snapshot is implied to occupy real space underneath New Clipperton.

“they’d decided not to remove the installation built underneath it.”

It's also described as having a boundary

“If people left the area the Snapshot covered, they vanished immediately.”

Towards the end of the story, it is revealed that the action has taken place within a 'Snapshot of a Snapshot'.

Does this mean each Snapshot also recreated the area beneath the city?

If this is true, and the Snapshot occupies physical space, then surely the area the Snapshots recreate would appear to be infinite, or does it just have to stop at some point?

Answer 1

I think I may have answered it myself, in that the Snapshot of a Snapshot was created only of the area beneath New Clipperton, and not of the city above, so it occupies the same space.