A Large Conveyor Belt                                  -      -      - 
(-------------------------------------------------)     W <---(M)---> -
                                                        -      S      -

The conveyor belt turns gradually to the left and far down the passsage
the giant hearths that are at the end of the tunnel.  Ducking as the rocks
fall randomly about you, you try to fan your burning face.  
You dodge out of the way of a large stalactite that is dislodged from the ceiling!