1,000 meters below

Meet the world's deepest underground physics facilities. A constant shower of energetic subatomic particles rains down on Earth's surface. Born from cosmic ray interactions in the upper atmosphere, this invisible drizzle creates noisy background radiation that obscures the signatures of new particles or forces that scientists seek. The solution is to move experiments under the best natural umbrella we have: the Earth's crust. Underground facilities, while difficult to build and access, are ideal...