An Icy Stream                                          -      -      - 
(-------------------------------------------------)     W <---(M)---> -
                                                        -      -     SE

As you travel deeper and deeper into the cavern's underground stream, the
air becomes more and more moist, as the water starts to make the air humid. 
A source of heat must be near-by, as there is no ice anywhere to be found,
although the water is just as cold.  To the west is a small side stream, and
to the south, the sounds of rushing water can be heard, even louder now.  
A small white salamander slithers about in the cold.