Apologies for bursting anyone's very nice bubble, but this fascinating creature is one of only stories. As an aspiring cryptozoologist, a scientist who studies this kind of stuff, I can tell you that I've never heard of it and a quick google search confirms it to be Creepypasta.
Sorry! But really, rather incredible Photoshop there.
Why would they have hands if they were to only keep them spread open like that while swimming? That would slow them down. Kinda leads me to believe its a fake...
Sorry! But really, rather incredible Photoshop there.