Tunnels of Carown Part VI

After the bat cavern, is a long stretch of winding tunnel. The walls in this area are smooth in spots and rough in others.  The height varies from further then a person can reach up and touch to a low height that some humans would have to stoop.  There are some bats in here, but not many.  It winds back and forth, always going downward.  Water flows here and there, moss growing randomly along the walls and floor. The only tricky part is a few pit traps that may or may not actually work.  (25% fail rate of the traps.)  These are 30 foot pits and of the three only one has spikes at the bottom.  The DC on these should be moderate for the first, easy for the second two.