Drama: The Investigation, BBC2, 9pm/9.40pm

A double helping of the drama sees the divers continuing their search for evidence, as Jens explains to Jakob that it is difficult without the exact trace of the route taken by the submarine. In the second episode, Jens asks the Swedish police to borrow their cadaver dogs, while Jakob procures a warrant to search the suspect’s hard drives. Starring Anders Juul (left) and Johan Esbjornsson (right). In Danish and Swedish.