"It was suppressed because of the changing political situation, particularly for the British," suggests Dr Toby Haggith, Senior Curator at the Department of Research, Imperial War Museum. "Once they discovered the camps, the Americans and British were keen to release a film very quickly that would show the camps and get the German people to accept their responsibility for the atrocities that were there."
The film took far longer to make than had originally been envisaged. By late 1945, the need for it began to wane. The Allied military government decided that rubbing the Germans' noses in their own guilt wouldn't help with postwar reconstruction.
Five of the film's six reels were eventually deposited in the Imperial War Museum and the project was quietly forgotten.