Deep in the ocean, there are strange and even scary creatures. But the most dangerous are sharks. There are about five hundred species of them. Some species can grow up to twenty meters, and some of them can fit into a pocket. Some sharks glow in the dark and act friendly. And some of them look forward to taking a bite of anything that moves. And the deeper you go into the ocean, the creepier the sharks get. But imagine you and your friends are spending the weekend on a yacht. You’re surrounded by sunshine and a warm ocean. You’re standing on the bow of a yacht and suddenly a wave moves the yacht up. The keys to your house fall out of your pocket and fall overboard. To get them, you’d have to dive down deep into the ocean. And meet the creepiest deep-sea sharks. In this video, you'll find out: Which sharks hunt whales? Is there life in water of sub-zero temperatures?