A Grooved and Sloping Tunnel                           -      N      - 
(-------------------------------------------------)     - <---(M)---> -
 WARNING: You are in a NEUTRAL PLAYER KILLING room.     -      S      -

The cave is obviously man made, tool marks and sharp angles along the
walls and ceilings attest to this fact.  The floor has two grooves worn into
the rock leading down into the tunnel.  The grade is steep here, a good
twenty degrees downward.  The temperature rises the further in as opposed to
above-ground mines where the temperature drops as you proceed further.