7. Tantalizing Tentacles
People may think octopi are cute and frightened beings, but they are actually terrifying. Some types of octopi are poisonous, and all of them have beak-like mouths in the middle of their tentacles. You would not want to get on their bad side.

Octopi are territorial, but they do not go after humans unless it is provoked. When necessary, they will defend their territory, which can cause people to be attacked. This one looks unhappy, and we would swim away if we were that diver.
8. Sea Snakes Or Seaweed
This looks like something straight out of Spongebob, although much more intimidating. From above, these might seem like swaying sea plants, but as you get closer, you will realize they have faces and mouthes to bite you.

These are a type of Eel closely related to snakes. The burry themselves in the ground and let to ocean move them around. Although these look small, some Eels can grow up to 160 pounds. These creatures are massive, and they are not so friendly.
9. You've Got Company
If you are a surfer, the worst scenario is encountering a shark. These predators usually attack surfers because they mistake them for seals. The sharks see the surfers silhouette from below, and they are easily mistaken. While not all sharks attack surfers, it is much more dangerous to be in this situation.

The surfer caught a glimpse of the shark in the wave and quickly turned around because he was terrified. There are plenty of surfing hotspots that also happen to be home to many sharks. These two often share the water, and we hope this man got out unscathed.
10. On The Hunt
If you have ever watched Shark Week on the Discovery channel, you have seen the way great white sharks swim straight up to the surface and catapult themselves into the air to catch prey. This photo was taken just as the shark is about to break the water's surface and bite down on whatever it is after.

Great white sharks are apex predators who have a unique way of hunting. They can jump almost 11 feet out of the water because of the power that they have while swimming. It is sad yet incredible to watch them hunt, but we would never want to be their prey.
11. Creatures Of The Deep
If you ever want to scare your friends, just show them this photo, and they may never go in the ocean again. There are some horrifying fish at the bottom of the ocean, and we barely know anything about them.

From the teeth to the shark-shaped body, to the bizarre snout, everything screams horrifying. These are called goblin sharks, and they stay in the far depths of the ocean. They go so deep that the water is dark because the sun doesn't shine that far down.
12. Powerful Attacks
Sharks are the most intimidating sea creatures because of their razor-sharp teeth and reputation for killing people. If you have ever seen any of the shark movies like Jaws, you probably think that sharks are bloodthirsty maneaters.

These sharks can swim up to 35 miles per hour as they accelerate to catch their prey. With agility and strength, sharks jump pout of the water even though they weigh a few tons.