Flowing Passageway                                     -      N      - 
(-------------------------------------------------)     - <---(M)---> E
                                                        -      S      -

The tunnel walls seem to flow in no general direction.  The walls ripple
as you pass by them, and you notice dark shapes swimming inside.  These dark
shapes follow you in whatever direction you go.  You can feel their
presence, and their eyes following you.  
A froglike being glares at you with beady eyes.
    You sense a hidden life form in the area.
A froglike being glares at you with beady eyes.