A Drainage Pipe                                        -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      -      -

There are small ledges on both sides of the tunnel, just large enough for
you to walk on.  However, due to the water, they have been eroded in some
areas.  The air is thick and moist.  There is a stream of water running down
the center of the tunnel.  You pray that you do not fall in for the water
does not look too inviting.  Slowly, something floats by and brings about a
very strong odor.  You can hear the loud sound of splashing water here.  
     A gas line runs along the top of the pipe here.
     Someone has been playing mumblety peg here, apparently.
A green slime slithers through here.