Master director Patricio Guzman travels 10,000 feet above sea level to the driest place on earth, the Atacama Desert, where atop the mountains astronomers from all over the world gather to observe the stars. The sky is so translucent that it allows them to see right to the boundaries of the universe. The Atacama is also a place where the harsh heat of the sun keeps human remains intact: those of Pre-Columbian mummies; 19th century explorers and miners; and the remains of political prisoners, "disappeared" by the Chilean army after the military coup of September, 1973.