T7.1

''The long tunnel curves slightly. Distant murmurs from unknown creatures deeper in the caverns can be heard.''

Searching the Walls
Perception DC 25 +1/10': You see a small crevice in the wall here, it looks like something burrowed it, it's only large enough for a small creature to crouch in, or a perhaps a medium creature to crawl through.

From K7
You poke your head out from the small burrow and peer into a larger tunnel. The air here is quite warm