A new documentary promises to release never-before seen evidence on the plot by a group of Holocaust survivors to poison hundreds of thousands of Germans in an act of revenge after World War II.

The film “Holocaust: The Revenge Plot” revolves around tapes of resistance fighter and later-poet Abba Kovner detailing his recollections of the plan, according to Britian’s Channel 4, which commissioned the documentary.

The tapes were recorded in 1985 as Kovner was dying from cancer and explore the 1946 plans to poison the water supplies in several German cities, and a second plot to kill thousands of SS officers being held in an American prisoner camp.