A Russian special-purpose missile submarine disappears without a trace during a secret mission in the Greenland Sea. A crew under the command of Viktor Voronin, whose older brother Alexander Voronin commanded the missing submarine, is sent to search for it.
The sailors are faced with the task of finding the submarine by any means necessary and preventing the new top-secret weapon from falling into enemy hands. At the same time, geological research at a polar station in the northern waters awakens the Kraken: a giant monster capable of merging with the underwater darkness, possessing an intellect of unknown nature. It is with him that the sailors will have to face, searching for the missing submarine.
