The good news was that nothing sentient had found its way into the tunnel besides the adventurers.  The bad news was that plenty of other things had.  Cobwebs decorated the area, and the only kindness to the poor halfling who had to wade in waist-deep water while the others only had leg-deep splashing was that the webs were too high up for a halfling to have to brush away.<br/><br/>One squeak led to another, and then another, as they moved further in.  Two nests of rats had been set up, and as the adventurers got close, it became quite apparent that none of the rodents appreciated being disturbed.  They formed into swarms, one on each side, assaulting the heroes.