A Darkened Tunnel                                      -      -      - 
(-------------------------------------------------)     W <---(M)---> -
                                                        -      -      -

Finally above the icy waters at the top of the chasm, steam rises from
the hole below.  The tunnel is completely dark, as there is no visible
source of light anywhere.  Though your inner senses can feel something
moving about in the darkness.  The sound of metal striking the hard stone
around you, can be heard from within the tunnels.  
A small white salamander slithers about in the cold.