Open Eyes, if you read that link you will understand. That article includes quotes from the filmmaker stating that there is no evidence, that the program was made for entertainment purposes, and that he doesn't necessarily believe in the existence of mermaids.
http://en.wikipedia.org/wiki/Mermaids:_The_Body_Found
The program was fictional. Sorry I didn't watch it myself but after reading your post I was hoping it was true. Maybe it was presented as a "true dramatization" or contained some other misleading come on. Are you familiar with the radio dramatization of War of the Worlds in the 1930's or 1940's that was presented to sound as if it were real?

I do believe in pollution and chemical contamination caused by fracking. There is no doubt about that.