K4

''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 T2.2
''You feel your way to the end of the tunnel. It was a moderately quick jaunt, with a sharp curve at both beginning and end.''

From T4.1
Y''ou feel your way to the end of the tunnel. It was a moderately quick jaunt, with a sharp curve at both beginning and end.''