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India's first nuclear weapon explosion took place on 18 May 1974. It was assigned the codename 'Smiling Buddha' and formally designated 'Pokhran I'. The thermonuclear device was detonated by the Indian Army in the long-constructed army base, Pokhran Firing Range, at the Pokhran Municipality, Rajasthan state, under the aegis of several key Indian army personnel. It was the first confirmed nuclear test by a nation outside the five permanent members of the United Nations Security Council. The test was developed and executed with the help of Canadian nuclear reactors and expertise.