A Wide Passage                                         -      N      - 
(-------------------------------------------------)     - <---(M)---> E
                                                        -      S      -

The tunnel has seemed to change, the dampness has dried out and the water
that once ran across the floor has completely dried in this part of the
tunnel.  The air now smells fresh instead of the stagnant air that permeates
other parts of the tunnel.  The walls and ceiling here are much smoother to
the touch as the tunnel floor changes from granite to hard packed soil.  
A manic depressive bullfrog has arrived from the north.