Archival maps as well. Old passageways and routes that may have been built over years ago. If you compare and contrast the historical with the modern, you would likely find what you're looking for.

[But Viktor already knows that if push comes to shove and they need to make an escape from the Free Cities, he'd only slow them down, and at worst would be a hinderance, out in the wilderness. His contingency plans are elsewhere.

He could talk about that, he supposes, given that Jesper is asking what he's working on. How his own plan involves escape of another kind. Viktor pauses for a moment, considering, and then settles on something else. Not a lie--but not the full extent of his current project.]

Back to the mines, I think. I have some unfinished designs for safety measures. Upgrades to current systems, that sort of thing.