A Smoothly Polished Tunnel                             -      -      - 
(-------------------------------------------------)     - <---(M)---> E
                                                        -      S      -

Moisture oozes from the walls of the tunnel, giving it a shiny slick
appearance.  Here and there, growing sporadically, are huge clumps of sickly
gray moss.  Despite the moss and the moisture the tunnel is remarkably clean
and gives the appearance of being well traveled.