A Glowing Tunnel                                       -      -      - 
(-------------------------------------------------)     W <---(M)---> -
                                                        SW     -      -

As you walk through this tunnel, you are able to make out vague details
of the things around you since the walls are giving off a very dim red glow.
At first you can't understand this phenomenon, but eventually the rising
temperature helps you to realize that the walls are in fact red-hot.  You
continue carefully on your way, wondering if you are headed towards the very
center of Hellbent Mountain.  You can see a large chamber illuminated by
flickering lights through a hole in the wall to the west.