Advantage to underground neutrino research

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I am an electical engineer who just likes to read about science. I have recently read a number of articles about neutrino research being done in old mines deep below the surface of the earth. Everything I have read about neutrinos indicates that they go through everything including the earth, so can someone explain to me why there's any advantage to underground research of this type? Thanks.
 
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It stops the unwanted particles from interacting with their equipment, such as cosmic rays.
 

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