This test, which may have only been partially successful, demonstrated a claimed yield of 12 kt. The device was emplaced in a vertical shaft and detonated at a depth of 107 meters. It is reported that the American intelligence community estimated that the actual yield was in the range of 4 to 6 kilotons. The test produced a crater with a radius variously reported at between 47 and 75 meters, and a depth of about 10 meters. First underground nuclear explosion at Pokhran in Rajasthan on May 18, 1974.
Photo shows a view of the creater formed after the explosion.
First underground nuclear explosion at Pokhran in Rajasthan on May 18, 1974. Photo shows a view of the creater formed after the explosion.