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US-Built Runit Dome Cracks, Risks Radioactive Leak

7/21/2026

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Story summary
  • The 115-metre Runit Dome, built by the United States in the 1970s on Marshall Islands, is cracking and could leak as sea levels rise.
  • 2019 Los Angeles Times investigation reported U.S. personnel knew of leaks but did not inform Marshallese government.
  • 2012 United Nations report warned radiation from the dome has caused irreversible contamination on the islands.
  • Marine scientist Stephen Palumbi said locals avoid coconuts and groundwater because they are radioactive.