Beneath this concrete dome on Runit Island (part of Enewetak Atoll), built between 1977 and 1980 at a cost of about $239 million, lie 111,000 cubic yards (84,927 cubic meters) or radioactive soil and debris from Bikini and Rongelap atolls. The dome covers the 30-foot (9 meter) deep, 350-foot (107 meter) wide crated created by the May 5, 1958, Cactus test. Note the people atop the dome.


Credit: Defense Special Weapons Agency