The Mariana Trench is known to be the deepest location on Earth and has a depth of about 36,201 feet! For comparison, Mount Everest, the highest mountain on our planet, is only about 29,000 feet tall. Now imagine—the entirety of Mount Everest can be submerged at the bottom of the ocean floor, and its summit still wouldn’t reach shallow waters.

Forget about the horrors of outer space because our planet’s oceans are just as terrifying. Sunlight in the ocean can only travel to a maximum depth of about 3,200 feet. Down in the twilight zone, it’s dark, food is scarce, and the pressure is immense. Just imagine what type of monsters lurk in this part of the ocean.

Let’s go through some of the most terrifying creatures in the deepest part of the sea. From the Predatory Tunicate to the Pelican Eel, here are 15 scary Mariana Trench creatures that you have never seen before.