The Edge of A Large Pit                                -      N     NE 
(-------------------------------------------------)     W <---(M)---> -
                                                        -      S      -

You are walking through a huge chamber somewhere beneath the surface of
the world.  There is a large pit to the east, and at the bottom you can see
a tunnel leading even deeper into the ground.  The edges of the pit are very
steep, and there doesn't seem to be any way to climb down safely at this
point.  Perhaps you will be able to find a better path somewhere nearby.