This 1946 British feature film from Ealing Studios, directed by Basil Dearden and starring Michael Redgrave and Derek Bond (himself a former POW), was filmed on location at a former German prison camp for naval officers (Marlag at Westertimke) from a script cowritten by Guy Morgan, also a former prisoner.
A German torpedo hit the RMS Lusitania on May 7, 1915. Shortly after, a substantial second explosion shook the ship. Within 20 minutes, the vessel known as the "Greyhound of the Seas" had sunk to the ocean floor, resulting in the deaths of almost 1200 individuals. A new two-step investigation...