The trio advance, surrounded as they are by red glowbugs they find their footing swiftly within the darkened hollowed corpse. The light flickering valiantly from the gullet of the monster is dim, and far away, but appearing closer then they'd once assumed.
Nana's steps light, and soundless as she keeps away from the ruddy light, cleaving to the shadows. The Summer's steps echo loudly as they step into the mouth and down the throat. Tiphon's concrete surrounded body echoing loudly. Stone against bone.
There is one grand path before them, the natural transition from mouth to throat to stomach, but this is not only a corpse, but a mine, there might be other pathways then the obvious, and they did indeed have tasks to complete.
If you want to look around, Perception-1 OR Wits+Investigation-1. If either of you want to join Nana in Stealthing around, Dex+Stealth+2