Radioactive waste from nuclear tests can leak into the Pacific Ocean.
According to UN Secretary-General Antonio Guterres, a concrete dome built on Runit Island at the end of the 1970s to contain waste from massive atomic bomb tests carried out after World War II could leak toxic sludge into the sea.
"The Pacific region has previously been victimized as we all know," said Guterres, according to AFP, referring to the nuclear explosions carried out by the United Kingdom States and France in the region.
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Islandland was where 67 American nuclear weapons tests were conducted, which included the 1954 "Bravo" hydrogen bomb, the most powerful ever detonated by the United States and about 1000 times larger than the A bomb dropped on Hiroshima, Japan.
In the Marshall Islands, many residents were forced to leave their country and thousands of others were subjected to radioactive fallout.
"I have just been with the President of the Marshall Islands [Hilda Heine] who are very worried that there is a risk of leakage of radioactive materials contained in a kind of coffin in the area," says Guterres, who touring Sydstilla about raising awareness of climate change , told AFP.
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Radioactive earth and ashes from the explosions were inserted into the crater and were cut with an 18-inch thick concrete dome seen as a temporary fix at the time.
Now, cracks have developed in the concrete and there are fears that it could break off at a tropical cyclone.
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"Many have to be done in relation to the explosions that took place in French Polynesia and the Marshall Islands," said the UN chief. "This is in relation to the health consequences, impacts on societies and other aspects. Of course, there are questions about compensation and mechanisms to enable these effects to be minimized."