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In 1962, the Soviet Union also performed a series of three EMP-producing nuclear tests in space over Kazakhstan called "The K Project". Although these weapons were much smaller (300 kilotons) than the Starfish Prime test, since those tests were done over a populated large land mass (and also at a location where the Earth's magnetic field was greater), the damage caused by the resulting EMP was reportedly much greater than in the Starfish Prime nuclear test. The geomagnetic storm-like E3 pulse (from the test designated as "Test 184") even induced an electrical current surge in a long underground power line that caused a fire in the power plant in the city of Karagandy. After the collapse of the Soviet Union, the level of this damage was communicated informally to scientists in the United States. Formal documentation of some of the EMP damage in Kazakhstan exists but is still sparse in the open scientific literature.
Small-scale EMP devices - capable of downing an airliner or killing the electrics in a hospital - are quite easy to make in theory.