text: are there any fish living in stream far away under the ground?   there are certain fish that live in harsh conditions in underwater lakes and pools in caves. i saw the program "planet earth" on the bbc, it had some cave dwelling fish and an unusual blind salamander creature.  see http://www.britannica.com/search@?query=cave&submit=find&source=mwtext  and  http://www.otleyaquaristsociety.co.uk/blind%20as%20a%20cave%20fish.htm  underwater fish tend to be blind, as there is no advantage in having eyes in a cave.