T2.2

''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 K4
''You poke your head out and peer into a tunnel. To you left a warmer an wet air flows, to your right it is a bit cooler though quite smelly.''

From R2
''The stench from the waste room recedes as you walk along. The air becomes warmer and the walls glisten with moisture.''

From R6
''The humidity from the air recedes as you walk along. The air becomes less warm but increasingly smelly.''