Scientists find around 2,000 new ocean species every year, and as time goes on, the creatures they find seem to become even stranger than before. It has been recorded as far down as 5,000 metres below sea level, where the pressure is … Explore the Marine Life Encyclopedia to learn fun facts and more about your favorite marine animals. Oceans cover 71% of Earth’s surface, and 97% of the water’s depths remain completely undiscovered. There are hundreds of accounts of these creatures – any culture that had contact with the sea has at least one form of sea monster reported in their mythological history. Deep-Sea Creatures 1. A sea monster is, by definition, any creature that comes from the sea – real or mythical – and is unusually large or threatening. They are very similar to sharks but they have very dangerous three-pointed teeth. Frilled Shark usually found thousands of feet below the surface. From sharks and sea turtles to ecosystems and corals, you’re in the right place to take a deep dive into life under the sea. This menacing creature is one of the deepest-living fish ever discovered. Frilled Shark. So, here we are listing the top 20 most terrifying deep-sea creatures.