22. Giant Jellyfish
There have been many horrifying sea monsters in world history, but very few are as creepy as a Giant Jellyfish. The reason for this is likely due to how creepy jellyfish are, period. Some may look beautiful while others freak you out just by looking at them, but the Giant Jellyfish will truly catch you off guard.
There’s even a name for these things, the Lion’s Mane Jellyfish. The reason for this is that it has some notable tentacles that can, upon movement in the water, look like a Lion’s mane. These jellyfish can grow to the size of a full-grown man! Like other jellyfish, they can sting. However, it has more bark than bite, as the stings from it are not lethal to humans.