23. Frilled Sharks
Often called the Frill-Toothed Shark by those who come in contact with the species, the Frilled Shark is certainly among the most horrifying sea monsters of recent memory. The species is not exactly worldwide, as they are mostly found around Japan these days. The population is also quite small with many hoping to never come across this species in the ocean.
All sharks can be dangerous and scary, but frilled sharks take things to an entirely different level. They have a face that can only be described as snake-like. It also has a body similar to that of an eel, so it moves around far differently. We did not even have actual footage of the species until 2004, so we’re still learning about this creepy species even today!