Animation showing how a Faraday cage (box)works. When an external electrical field (arrows)is applied, the Electrons (little balls) in the metal move to the left side of the cage, giving it a negative charge, while the remaining unbalanced charge of the nuclei give the right side a positive charge. These induced charges create an opposing electric field that cancels the external electric field throughout the box.

This cache is hidden in a giant Faraday Cage of sorts. You will find it in the center of the cage. There you will find a giant "V", the cache is located up high so it will not be friendly for the vertically challenged. You are looking for a little brown bugger that is magnetic. A little climbing may be in order.