What island is that? Runit Island, Enewetok Atoll! In 1977, the United States military began decontamination of Enewetak and other islands. During the three-year, $100 million cleanup process, the military mixed more than 111,000 cubic yards (85,000 m3) of contaminated soil with Portland cement and buried it in an atomic blast crater. Today, a concrete dome covers the material.