Actually guys, give Davaris a pass on this one. The "documentary" was a very wrong-headed attempt to punk the public a la Orson Welles' War of the Worlds broadcast in 1939.
Unless you happened to catch a VERY subdued disclaimer, this offbase media ploy was couched in such scientific clothing that it would take a pretty highly educated person to see through it on appearances alone. Those who claim that they "saw right through it" are almost certainly lying to everybody else, but may have "immediately Felt right through it", because they are simply skeptical adults who have completely lost their childhood wonder --- which Davaris, charmingly, has not.
I sadly wasted about ten minutes of my time wondering "what-the-heck-IS-this?" until turning it off due to the evolutionary impossibility of what was being shown, plus the concept of a species of macroscopic numbers affiliating with a well-studied surface-inhabitant species [dolphins] without being thoroughly discoverable long ago by aerial photography, sonar, and direct visual means. I doubt that we should hold Davaris to similar reasoning processes.
We SHOULD however kick someone's butt in that media for playing that kind of game on the public. All sorts of folks are now out there in the world thinking that Merpeople are a proven fact. ... kind of thing which enrages an old fact seeker.