Joachim Heden's latest title tells the story of two sisters whose relationship has never been easy. The girls inherited from their mother a passion for diving, which also helps them shorten the distance between them. Much of the movie takes place underwater, where the younger of the Tuva sisters is pinned down by a rock at the bottom of the sea. Her older sister Ida must find help as soon as possible, but unfortunately there is no living soul within a radius of several kilometers. A murderous race against time begins, in which every second is of importance to life and death.