K5

''You travel through the small tunnel, crouching low. This tunnel was clearly carved out by the Kobolds themselves. Made for them to scramble through in single file and just width to squeeze past another small creature such as themselves.''

Random Kobold Encounter:

From R3
''You feel your way to the end of the tunnel. A trek that weaved and turned to the left after becoming fairly hot halfway through.''

From T43.1
You feel your way to the end of the tunnel, a trek that weaved and turned to the right before becoming fairly hot halfway though.