Mighty nature is full of miracles... These famous words can also be applied to the World Ocean, which has still been little studied and is fraught with so many mysteries. But everything mysterious and incomprehensible has attracted people from time immemorial. Unsatisfied curiosity created mythical and sometimes scary images in the imagination... Do giant monsters, huge octopuses and squids, unknown monsters sometimes the size of a multi-story building and weighing as much as a ship really hide in the depths of the ocean? Do such mysterious creatures as Nessie and Caddy really exist? and the Kraken, or are these the fruits of the imagination of frightened people? Is there life at a depth of 10 kilometers and how does it manifest itself? You will learn about all this and much more, no less interesting from the life of the inhabitants of the deep sea, from the wonderful book by Michael Bright “Are there sea monsters ....”