Runit, Nuclear waste containment site on Enewetak Atoll, Marshall Islands
Runit is an island in Enewetak Atoll of the Marshall Islands in the Pacific Ocean, marked by a large concrete dome. The dome measures 350 feet (107 meters) across and rises about 25 feet (8 meters) above the ocean, covering contaminated material from the nuclear testing era.
The United States conducted dozens of nuclear tests in this atoll between 1946 and 1958, heavily contaminating several islands. Between 1977 and 1980, the American military gathered radioactive debris from six islands and sealed it beneath this concrete structure.
The traditional name of this island comes from the Marshallese language spoken by people who sailed these waters for centuries. Today the area remains off-limits to local residents, and the original inhabitants cannot return to their ancestral lands.
The island is closed to visitors, and scientists require special permits to conduct measurements on-site. Teams wear protective equipment and collect soil and groundwater samples to monitor the spread of radioactive materials.
The dome contains plutonium-239, which has a half-life of 24,000 years and remains dangerous throughout this period. Rising sea levels threaten the stability of the structure, as saltwater slowly attacks the concrete slabs and increases the risk of leaks.
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