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1939, the sound of boots echoes throughout Europe. Nazi Germany weaves its web, annexes Austria and invades Poland. England and France declare war on it. At the same time, the physicist Albert Einstein, a refugee in the United States, is worried about European scientific advances. Alerted by one of his former students, he decides to warn President Franklin Roosevelt: the French and Germans will soon succeed in uncovering the nuclear secret and will be able to manufacture a new weapon of unimaginable power. In Germany, it is Werner Heisenberg, Nobel Prize in Physics in 1932, who is the most talented and the most advanced in nuclear research. In France, research is carried out under the aegis of the couple Nobel Prize in Chemistry in 1935, Irène Curie and her husband Frédéric Joliot-Curie. From October 1939, they carried out their research under the supervision of a newly created organization, the CNRS. A crazy race against time then began, mobilizing scientists, politicians and secret services. Because to advance in their work, German and French scientists needed a substance, extremely rare, produced by only one factory in the world in Norway: heavy water. It was the most incredible and secret battle of the Second World War. It was called the Battle of Heavy Water. Whoever had heavy water would have mastery of the atom. But the Third Reich would not have the bomb. Norwegian resistance fighters, French scientists and American researchers would prevent it. This film tells the story of this little-known episode of the Second World War thanks to unpublished testimonies, surprising archives and images from a 1948 fiction film of great originality since all the protagonists play their own role. Directors: Nicolas Jallot Year of Production: