EMP
Karaganda suffered the most severe electromagnetic pulse effects ever observed when its electrical power plant was set on fire by currents induced in a 1,000 km (620 mi) long shallow buried power cable by Soviet Test ‘184’ on 22 October 1962. The test was part of ‘Operation K’ (ABM System A proof tests), and consisted of a 300-kiloton high-altitude nuclear explosion at an altitude of 290 km (180 mi) over Zhezkazgan. Prompt gamma ray-produced EMP induced a current of 2,500 amps measured by spark gaps in a 570 km (350 mi) stretch of overhead telephone line to Zharyq, blowing all the protective fuses. The late-time MHD-EMP was of low enough frequency to enable it to penetrate 90 cm (35 in) into the ground, overloading a shallow buried lead and steel tape-protected 1,000 km (620 mi) long power cable between Aqmola and Almaty, firing circuit breakers and setting the Karaganda power plant on fire .
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