Small Tunnel                                           -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

This small tunnel shoots into the sides of the corridor.  Streams of
water come from the celing making the floor wet.  There are small cracks in
the walls that let gusts of cold air blast into the room.  
A skeleton is walking amongst the living here.
An undead zombie is walking about here.