<I'm just gonna push you along since there's nothing dangerous ahead, at least for the time being.>
Stepping out into a new room, the party finds themselves in a hallway built into the canyon. Ioun torches float near the ceiling, giving modest light to what almost seems like a mine shaft at first, wooden bracing spaced to help keep the corridor stable, but lacking in a cart track and any hint of mining activity, suggesting otherwise. The place you are in is very makeshift and non-architectural, and the materials you have just left behind may have been intended to help fortify construction.
<If you don't have an Ioun torch, now is the time to nab one.>