A Long Tunnel                                          -      N      - 
(-------------------------------------------------)     W <---(M)---> E
                                                        -      -      -

The tunnel here is much darker than the previous area, the torches in the
sconces lining the walls have long since blown out.  Holding your torch
high, you see evidence that although the tunnel is still in use, it's
infrequently traveled.  Layers of thick dust coat the floor in most places,
only a thin line of footprints down the center of the corridor.