Discovery Channel aired "Mermaids: The Body Found" on Sunday, a two-hour special in which two scientists testify they found the remains of a mermaid. However, some viewers seemed disappointed about the material that was presented.

While the documentary didn't prove the existence of the legendary sea creatures, half-human, half-fish, it's creators claim their findings make a strong case for the existence of mermaids.

"This channel used to be about FACT, not theories that aren't "perhaps...totally implausible," one user with the nickname 2rightu wrote online Sunday night.

"This would have made a great April Fool's Day show!" user Dana Silver noted.

"Beginning of the show: Do mermaids exist? Two hours later: No," user Ian Souter wrote.

The special follows two government scientists who claim to have found the remains of a "never before seen sea creature" with ties to human origins at a particular beaching. The documentary also features amateur video, photographic evidence such as photos taken by two boys with a cell phone in Washington State and audio recording that suggest mermaids exist. (Watch Below)

The only two facts mentioned in the documentary are, first that in the early 1990s, the US Navy began a series of covert sonar tests, which were linked to mass die-offs of whales, which washed up on beaches throughout the world. For years, the Navy denied they were responsible for these beachings and second that in 1997, scientists at the National Oceanic Atmospheric Administration (NOAA) recorded a mysterious sound (called “The Bloop”) in the deep Pacific, which was thought to be organic in nature. It has never been identified.

But the film is a mix of the scientist's findings with "science fiction." It heavily relies on several CGI images to help people imagine how would mermaids look like if they existed, how would they swim, hunt and survive, the creators of the documentary admit

To add to it's credibility, the documentary presents the "Aquatic Ape Theory," a scientific theory which claims that humans had an aquatic stage in our evolutionary past. It claims that while human beings evolved into terrestrial humans, our aquatic relatives turned into something similar to a mermaid.

The theory expands on the possibility that some human ancestors didn't retreat from the water when the coastal flooding occurred millions of years ago, and instead went in deeper out of necessity and to find food.

“The theory of ‘aquatic ape’ mentioned in the program is real and has been studied for decades,” says Charlie Foley, creator, writer and executive producer of the show, and SVP of Development. “Many events in the show have occurred — i.e. the whale beachings, Navy experimental sonar testing, The Bloop…”

But authorities in the field in the United States have denied mermaids exist.

As recently as May, when the documentary first aired on Animal Planet, the U.S. National Oceanic and Atmospheric Administration released the following statement:

"No evidence of aquatic humanoids has ever been found," the NOAA said in a statement in May, following the world premiere of the documentary on May 27 on Animal Planet.

The NOAA claimed that mermaids only exist in the "collective unconscious" - as they have been mentioned from Greek Mythologies to ancient Far East and Australia mythologies-, and that is the job of historians, philosophers and anthropologists to explain why they exist there.

Watch the "Mermaid" body found on the Beach Below:

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