Chagai-I

Several historical and political events and personalities in the 1960s and early 1970s led Pakistan to gradually transition to a program of nuclear weapons development, which began in 1972. Plans for nuclear weapons testing started in 1974. Chagai-I was Pakistan's first of two public tests of nuclear weapons. Pakistan's second nuclear test, Chagai-II, followed on 30 May 1998. In 2005, Benazir Bhutto testified, "Pakistan may have had an atomic device long before, and her father had told her from his prison cell that preparations for a nuclear test had been made in 1977, and he expected to have an atomic test of a nuclear device in August 1977." ==Location==

's scientists chose sites at the high-altitude granite mountain ranges with extreme hot weather. Safety and security required a remote, isolated and unpopulated mountainous area. Throughout the 1980s, the Governor of Balochistan, General Rahimuddin Khan, led the civil engineering work. ==Decision-making==

After India's Pokhran-II tests on 11–13 May 1998, statements by Indian politicians further escalated the situation. Prime Minister Nawaz Sharif curtailed his state visit to Kazakhstan to meet with President Nursultan Nazarbayev and returned to Pakistan. The decision to conduct tests took place at a meeting that Sharif convened with the Chairman joint chiefs, General Jehangir Karamat, Dr. Abdul Qadeer Khan, Ishfaq Ahmad, and Munir Ahmad Khan and members of the Cabinet of Pakistan. Popular public opinion in Pakistan was in favor of nuclear blasts. Information minister Mushahid Hussain was the first who argued for the tests in reply to the Indian nuclear tests. The Opposition leader, Benazir Bhutto, spoke emphatically in favour of Pakistani atomic tests. Chairman joint chiefs, General Karamat and Air chief ACM (General) Parvaiz Mehdi Qureshi supported the matter and left the decision on the government. Naval chief Admiral Fasih Bokhari and Finance Minister Sartaj Aziz argued against the tests on financial grounds; though Aziz later staunchly backed the decision to test calling it as "right decision." Dr. Abdul Qadeer Khan argued in favor of tests and was supported by Samar Mubarakmand and Munir Ahmad Khan while Dr. Ishfaq Ahmad argued that "the decision to test or not to test was that of the Government of Pakistan despite the say of the scientific community." Concluding the final arguments, Ishfaq Ahmad said: "Mr. Prime Minister, take a decision and, ''Insha'Allah'', I give you the guarantee of success". With the G8 group's sanctions having very little effect on India and skepticism towards United States commitment, the Pakistani government economists built up the final consensus hardening around the idea that "there is no economic price for security". Despite being under pressure by president Clinton, Prime Minister Sharif authorized the nuclear tests by ordering the PAEC in Urdu: "Dhamaka kar dein" (lit. "Conduct the explosion!") In May 1998, a C-130 aircraft with four escorting F-16 Falcon jets secretly flew the completely knocked down sub-assembly nuclear devices from Rawalpindi to Chagai. In 1999, in an interview given to Pakistani and Indian journalists in Islamabad, Sharif said: If India had not exploded the bomb, Pakistan would not have done so. Once New Delhi did so, We [Sharif Government] had no choice because of public pressure. ==Weapon yield==

(right of the man in the blue beret), Tariq Salija, Irfan Burney, and Tasneem Shah. The better known A. Q. Khan of Kahuta Research Laboratories (KRL) is left of the man in the blue beret (who may be General Zulfikar Ali). The Pakistan Atomic Energy Commission (PAEC) carried out five underground nuclear tests at the Chagai test site at 1515 hours (PKT) on the afternoon of 28 May 1998. The TPG predicted the total maximum test yields with an energy equivalent to be ~40 kilotons of TNT equivalent, with the largest (boosted) device yielding 30–36 kilotons. Other scientists estimated a yield of 6–13 kilotons or, based on the seismic wave data, a yield of 12–20 kt. The PAEC's mathematics division placed the scientific data in the public domain and published seismic activities, mathematical graphs, and mathematical formulas used to calculate the yield; though certain scientific information remains classified. From scientific data received by PAEC, it appears that Pakistan did not test a thermonuclear device, as opposed to India. Shortly after the tests, former chairman and technical director Munir Ahmad Khan famously quoted: "These boosted devices are like a half way stage towards a thermonuclear bomb. They use elements of the thermonuclear process, and are effectively stronger atom bombs..... Pakistan has had a nuclear capability since 1984 and all the Pakistani devices were made with enriched uranium." On the other hand, Abdul Qadeer Khan further provided technical details on fission devices while addressing the local media as he puts it: "All boosted fission devices using Uranium 235 on 28 May. None of these explosions were thermonuclear, we are doing research and can do a fusion test if asked. But it depends on the circumstances, political situation and the decision of the government. As opposed to India's thermonuclear approach, Dr. N. M. Butt, senior scientist, stated that "PAEC built a sufficient number of neutron bombs— a battlefield weapon that is essentially a low yield device". ==Reactions ==

In Pakistan, the news of the nuclear detonations was met by street celebrations. The Directorate of Technical Development of PAEC which carried out the Chagai tests issued the following statement soon after the tests: Pakistan's President Rafiq Tarar declared a state of emergency, which introduced measures to protect Pakistan's finances and currency. After the test, the national media in Pakistan posted biographies of the involved scientists. Senior scientists and engineers were invited by academic institutes and universities to deliver lectures on mathematical, theoretical, nuclear and particle physics. The institutes bestowed hundreds of silver medals, gold medallions and honorary doctorates to the scientists and engineers in 1998. International The Chagai-I tests were condemned by the European Union, the United States, Japan, Iraq, and by many non-Organisation of Islamic Cooperation (OIC) countries. The United Nations Security Council adopted Resolution 1172, condemning the tests by both India and Pakistan. From 1998 to 1999, the U.S. held a series of talks with Pakistan to persuade them to become party to the Comprehensive Nuclear-Test-Ban Treaty (CTBT) and the Non-Proliferation Treaty (NPT), with Pakistan refusing amid a fear of lack of security commitment by the U.S. and the growing ties between India and the United States. The U.S., Japan, Australia, Sweden, Canada, and International Monetary Fund (IMF) imposed economic sanctions on Pakistan. All new U.S. economic assistance to Pakistan was suspended in May 1998 though humanitarian aid continued. ==Commemoration==

in Islamabad Signed into law by Prime Minister Nawaz Sharif, 28 May is officially declared as Youm-e-Takbir (lit. Day of Greatness), as well as National Science Day, to commemorate the date of the first five tests and honour the scientific efforts to develop the program. The Pakistani government established the Chagai-I Medal, first awarded in 1998 to the scientists who witnessed the tests. The granite mountains are visibly shown in the gold medallion and equal ribbon stripes of yellow, red and white. ==See also==