ou, 4. Os recipientes de resíduos são armazenados dentro de uma caverna, e o vazamento de radiação dos contêineres é amplamente contido dentro (além da distância vertical entre os Millenários e os Centenários). Os milenários são expostos porque trabalham dentro da caverna, próximo ao lixo:
"Have you seen the stuff?" Lio asked.
"Oh yes. It is in cylinders, in a cavern in the rock. We see it every day."
e, com o risco de sugerir que existe alguma ciência envolvida aqui:
Yucca Mountain is a ridge made up of layers of volcanic rock known as tuff. Scientists believe that tuff has special chemical, physical, and thermal characteristics that make it extremely suitable for burying radioactive waste. As long as the waste stays solid and remains deep underground, it should not pose a threat to the environment or to human health as the layers of tuff shield the radiation.