A Murky Tunnel                                         -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

  You have once again found yourself in another underwater tunnel.  Unlike
the last one, this tunnel has absoluetly no specific current within it. 
However, the water is not as clear as the other tunnel and makes it
difficult to see where you are going.  Because of that you really have no
idea which direction you are traveling within.