In May 1998 Pakistan courted international criticism after it responded to an Indian nuclear test, with an explosion of its own. In 2011 Rob Walker spoke to Dr Samar Mubarakmand who organised the test on the Pakistani side.

Photo: Pakistan nuclear scientist Dr. Samar Mubarakmand (right) alongside Dr. Ishfaq Ahmed and Minister of Information Mushahid Hussain, in front of the hill under which Pakistan conducted its nuclear tests in May 1998 (SAEED KHAN/AFP/Getty Images)