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Helicopter doing Electromagnetic Survey over Truro, England, UK

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On February 25, 2025, in Truro, England, UK, @british.culture60 shared a video of a helicopter flying overhead while carrying a large metal circle. In the video, the author is outside when they notice the helicopter with a rope attached, lifting and transporting the wide metal structure across the sky. This system is called HeliEM or Heliborne Electromagnetic Survey. The principle of operation is as follows. A current is passed through a loop, creating an electromagnetic field, In response to this field, currents are induced underground, special sensors measure the resulting secondary field, which allows us to understand the structure of underground rocks.

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