I am pretty sure this is the movie I have stuck in my head.
If they catch fish and can't eat it because of high mercury levels, then it definitely is.
shareIf they catch fish and can't eat it because of high mercury levels, then it definitely is.
shareThat sounds like Prophecy.
http://www.imdb.com/title/tt0079758/
As the previous poster said, it's the plot of "Prophecy." It's definitely not this film. If you saw it, you would probably remember the mud monster.
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