This film traces the development of the first French nuclear bomb, from its construction to its explosion in the Sahara on February 13, 1960. This operation was called “Gerboise Bleue,” although the narrator does not mention it. At that time, nuclear weapons were possessed by three major powers: the United States, the Soviet Union, and Great Britain. In turn, France, under the responsibility of the Military Applications Division of the Atomic Energy Commission, embarked on its own nuclear testing program.