The US Congress has demanded an investigation into a concrete dome full of nuclear waste, threatened by rising sea levels in the Marshall Islands.

Dubbed “the tomb”, it holds tonnes of radioactive debris from dozens of US atomic bomb tests carried out during the Cold War.

Congress wants the Department of Energy to report back on the state of the ageing Runit Dome within six months.

The demand is part of a huge defence bill approved by President Trump.

More than 40 nuclear weapons tests took place on or near the Enewetak Atoll in the Pacific between 1946 and 1958, including a bomb test on Runit Island.

The crater from that blast was used from the 1970s by the Defense Nuclear Agency to store nuclear waste. It was later covered in thick concrete slabs to form the 377ft (115 metre) protective dome.

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The condition of the dome was highlighted in a recent Los Angeles Times investigation, which also unearthed evidence of biological weapons tests and the shipping of 130 tonnes of soil from nuclear testing grounds in Nevada to the Marshall Islands.

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