The Hook Island Sea Monster, also known as the Tadpole Creature, was an aquatic cryptid reportedly sighted off the coast of Hook Island.
The monster was sighted by Robert Le Serrec and his family in 1964 when it moved towards his ship with its mouth open as if to attack. He spotted its tail was injured, probably by a ship’s propeller or by a larger creature.
The creature was described as enormous, roughly 70-80 feet in length. It resembles a giant tadpole, has a gaping mouth with small teeth, and eyes placed on top of its head. The skin looked more like that of a shark than an eel. There were no apparent scales.
There are several explanations as to what the creature could be. Theories include:
An undiscovered species (a Cryptid)
A giant salamander/axolotl
The evidence that it is fake and that it is real are equally balanced out. Some say it was hoaxed using Photoshop, but that wasn’t invented back then. Others say it was a large sheet of plastic weighed down by sand.
In their book Field Guide to Lake Monsters, Sea Serpents, and Other Mystery Denizens of the Deep, Loren Coleman and Patrick Huyghe stated that the case was a hoax.