The Hook Island Serpent is a cryptid encountered only two or three times off the coast of Hook and Thomas Island, between the mainland and the Great Barrier Reef. The most famous witness, was in 1964 when Robert Le Serrec recently bought a motorboat and decided to camp on Hook island. While on his boat, his wife noticed a 70 foot long animal shaped like a tadpole resting on the seabed.

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They took photos of the animal, which they thought was dead, and Le Serrec’s friend, De Jong, who was with them jumped into the water to film it. When De Jong got closer to it, the animal opened its mouth and started swimming towards them. Scared, he quickly swam back to the boat and the animal fled. The witnesses claimed to have seen a wound on the animal, which they guessed was from a ship's propeller in open water and took refuge in the shallow bay to recover. Le Serrec also noted that its eyes, located on the top of its head, were pale with slit-shaped pupils. It had pale stripes and had smooth skin with no fins or flippers. The location of the eyes on the top of the head indicates it is probably a carnivore that lurks on the seabed, looking upwards for prey.

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Contrary to popular belief, there were other sightings of this cryptid. In 1936, Fisherman Jack Frisch and his grandson, Ted, claimed to have caught an unknown animal matching the description of the photos on his set line, albeit smaller. He killed it, planning to take it to town to show people the strange animal, but due to the heavy seas, he couldn’t. He said it has a disproportionately large snake-like head and a bull-like neck. The neck tapered to its body, which resembled that of an eel’s. Years earlier, a group of teenagers claimed to have seen a sea serpent matching the description of the earlier sightings off Thomas Island, 50 kilometres away and apart of the same archipelago, known as the Whitsunday Islands.