 In the Fjords of a small Norwegian fishing village a small boat manned by three drunken fishermen is attacked by what appears to be a giant sea monster. When Admiral Nelson hears of this he is fascinated by it and takes the Seaview to the Norway to investigate and interview the one survivor. The villagers are not happy to see them and reluctant to talk and answer questions. Someone is so desperate to keep their silence that the survivor is murdered before he could talk. With no one willing to talk Nelson is preparing to leave when they discover evidence of giant sea life. Nelson is determined to solve this mystery.