A Dim Passage                                          -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

You are in a dim passage in the caverns.  The air here is stale, but you
catch whiffs of a much more pleasant aroma.  Softly-glowing lichen is
growing on the walls here, lighting your way.  The floor is a light-gray
stone, with patches of earth and moss here and there.  You can hear the
sound of animals moving about.  The caverns run to the north and south here.