The story of two brothers who lose track of each other after an unstable childhood until they meet up again in prison is the focus of former ‘Dogme’ director Thomas Vinterberg’s film based on a book by Jonas T. Bengtsson, a Danish novelist celebrated for his unflinching realism. The film’s title refers to a method of torture known as ‘submarino’ in which the target’s head is held under water to just before the point of drowning.