ooc - So, marching order appears to be Ys-Korros (torch), Aurial, Danwyn, Pyior, and Ys-Baddaden (glow globe).
The tunnel continues back for a surprising distance, several hundred yards at least, before it emerges into a more natural-looking cave formation. The natural cave is still quite narrow in most spots, made primarily of limestone, and clearly has had the floor leveled in many spots with dirt (presumably excavated in the creation of the tunnel). Narrow crevasses in the dirt indicate that water does still flow through here from time to time. In this softer dirt, footprints are still clearly visible.
The smell of feces and urine continues to grow stronger, though you are moving further from the keep's own latrine. Added to that smell is one of alcohol.
As you reach a long straight stretch of hall, everyone hears a sharp bark echo through the cavern. Everyone freezes, listening. The bark is followed by some more yips and gutteral language - rhodinspeak. It changes into a short burst of (presumably) laughing between several voices.
Distance is difficult to discern in the cavern, but the voices are probably about a hundred or so feet ahead. This stretch of cave is narrow and has numerous stalagtites and stalagmites further impeding easy movement. (Single file at best and anything more than half movement will require a Dex or tumbling check.)