Within the Asteroid II
Bypassing the hatch, they continued through forest. They took a bearing and realised the power plant was not just somewhere a hundred metres through rock, it wasn't even on this "facet" of the massive agriculture chamber. That is, they would need to cross into one of the other pentagonally-shaped facets of the chamber to be closest to the right spot.
GM Note: the chamber is shaped like an 12-sided die with an artificial sun suspended in the middle. You are on the "inside". The different facets are separated by some sort of barrier. As the asteroid has spin, you would normally only feel gravity on one side, but there is obviously artificial gravity that is operational.
After hours more travel through dark forest, Jedec realised he could barely see something dark and massive ahead of them, taller than the trees and blocking their further travel. Consulting his map he realised this must be a barrier of some kind, separating them from the section they wanted to get to.