covers an area the size of six hundred thousand soccer pitches and is located in one of the flattest and most remote regions of suffer america head to cheers scientists are able to detect and measure cosmic rays. this is a spark chamber a device for detecting electrically charged particles. when a charged particle passes through the chamber it triggers a flash of light this shows the path of the particle. the particles have so much energy that they cross the chamber with ease. but the spot chamber is not very efficient many of the particles whizzing around and into us do not show up here.