Chagai-I

Chagai-I
All five atomic devices were spherical-implosion-type nuclear weapons
Information
Country	Pakistan
Test site	Ras Koh Hills, Chagai, Balochistan, Pakistan
Period	May 1998
Number of tests	5
Test type	Underground tests
Device type	Fission / Fusion
Max. yield	40 kilotons of TNT (170 TJ) See note
Navigation
Previous test	Kirana-I
Next test	Chagai-II

Chagai-I is the code name of five simultaneous underground nuclear tests conducted by Pakistan at 15:15 hrs PST on 28 May 1998. The tests were performed at Ras Koh Hills in the Chagai District of Balochistan Province.

Chagai-I was Pakistan's first public test of nuclear weapons. Its timing was a direct response to India's second nuclear tests, on 11 and 13 May 1998. These tests by Pakistan and India resulted in United Nations Security Council Resolution 1172 and economic sanctions on both states by a number of major powers, particularly the United States and Japan. By testing nuclear devices, Pakistan became the seventh nation to publicly test nuclear weapons. Pakistan's second nuclear test, Chagai-II, followed on 30 May 1998.

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, that began in 1972. Plans for nuclear weapons testing started in 1974. Chagai-I was the result of over two decades of planning and preparation, Pakistan becoming the seventh of eight nations that have publicly tested nuclear weapons.

The timing of Chagai-I was a direct response to India's second nuclear tests, Pokhran-II, also called Operation Shakti, on 11 and 13 May 1998. 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.