16. The Sea Monster of Hook Island
The only documented sighting of the Hook Island Sea Monster occurred in December of 1964. However, during a scientific expedition launched shortly after, countless similar photos came to light. On top of that, most native Hook Island residents claim to have seen the creature at least once.
When they first spotted it, Robert and Marie Serrec were snorkeling off the coast of Hook Island – a popular vacation destination in Australia. The enormous snake-like creature was resting on the ocean’s floor, so the Serrecs swam over it to get a closer look. They found out just how quickly they can swim after the ‘sea monster’ woke up and coiled around nearby coral reefs.