DRAMA The Investigation

BBC2, 9pm & 9.40pm The drama, which was inspired by a true story, continues as Jakob discovers just how hard it is to find evidence when the divers and volunteers don’t know the exact route of the submarine. Help may be at hand in the second part of the double bill, though, as Jens asks the Swedish police to bring in their cadaver dogs, while an oceanographer with knowledge of the tides lends his expertise on the complex currents.