15. Bobbit Worms
We’re pretty sure we have already expressed our displeasure with worms. However, the one mentioned earlier does not even scratch the surface when it comes to worms found in the sea. One of the creepiest of all is the Bobbit Worm. In some ways, it can be kind of beautiful as it does have a coloring that is incredibly unique. Yet the beauty just hides the horrors!
They have the ability to turn completely inside and out, and they have sharp teeth. Its teeth are sharp and capable of killing a number of sea creatures. What puts them on our horrifying sea monsters list is that they can actually cut humans, possibly even bite a finger clean off. They can also grow up to a little over 9 feet in length too!