three lakes in Oklahoma (Lake Thunderbird, Lake Oolagah and Lake Tenkiller), where it attacks and kills unsuspecting swimmers. According to legend and rumor, this freshwater demon measures the size of a horse and resembles an octopus, with long tentacles and leathery, reddish-brown skin. Skeptics question how an octopus could survive in freshwater lakes, as they are only found in the oceans. But it is easy to believe that such a creature would be a fearsome predator. The Giant Pacific Octopus, for example, has tentacles that each boast the strength of a 200-pound man and a powerful beak that it uses to kill prey.
Although no physical evidence exists in the case of the Oklahoma Octopus, many point to the high mortality rate and large number of unexplained drownings in the Oklahoma lakes as a clear sign of its presence. There have also been numerous reported sightings. Cryptozoologists have pointed out that a species of jellyfish has been able to adapt to freshwater conditions, and the same adaptation may have been possible for a giant cephalopod trapped in an inland lake when coastal waters receded.
In Lost Tapes It Attacks and drown people celebrating in A Lake In Oklahoma.