Buried metals over time decompose or precipitate to form chemicals that are different for each metal. This chemical shield reacts with other materials, such as magnet poles. Many companies experiment with different materials And see their reaction to the chemical state of the burial ground They have started building such systems These systems pose many risks to the human lungs and eyes You can look for transmitter or receiver devices or infrared or magnetic, etc. to detect metals that are harmless to humans.
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No matter how the speed of light is high , Darkness is one step ahead .
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