"On February 23, 2006, the US and UK carried out a joint subcritical nuclear test in the Nevada desert. Code named Krakatau, it was the 22nd subcritical experiment to date since they began in 1997.""... the US, Russia, and United Kingdom are still conducting nuclear weapons tests, known as "subcritical" tests, in violation of the fundamental spirit of the CTBT. These are massive underground nuclear experiments using chemical high explosives to blow up nuclear materials, including plutonium. They are called subcritical because the tests do not produce a nuclear chain reaction."
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