Since it is prohibitively expensive to build a sufficiently large tank of water, physicists Halzen and Morse pursued a suggestion from a glaciologist: Look for neutrinos in the vast expanses of ultra-clear ice in Antarctica. At depths greater than about three- quarters of a mile, the pressure inside the glaciers squeezes ou t air bubbles, creating an extremely transparent me dium in which a photon of light trave ls an average of 700 feet before being absorbed. Dow n there, the ice is bathed in a continuous blue glow from millions of sparking muons. The primary task of the AMANDA sensors is to study this glow and track how the muons travel through the ice. All the downward-m oving muons come from low-energy neutri nos created in the atmosphere above the South Pole. The interesting ones will be those movin g upward, which are mostly more energet ic particles originating from the sun or from somewhere far beyond the sola r system. The intensity of each blue flash reveals the energy of the neutrino that produced it.