Airborne Transient Electromagnetic
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China conducts test flight of a giant coil array. Can it detect nuclear submarines?
At an undisclosed test site, a helicopter takes off, towing a kite-like array of massive coils. The system, called Airborne Transient Electromagnetic (Atem) detection, works by firing a powerful pulse of electricity through a giant transmitter coil. This creates a brief, strong electromagnetic field that penetrates the ground or water.