On October 9, 2006 (August 18, 2006), North Korea conducted a subterranean nuclear test in Salt Lake, North Korea, for the ninth country to have nuclear weapons. On October 9, 2006, North Korea conducted a subterranean nuclear test in Salt Lake, North Korea, for the ninth country to have nuclear weapons. It is that the nuclear test was conducted on the basis of scientific calculations. The nuclear test did not occur "like the danger of radiation leakage".