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In 1977, US authorities put the most contaminated debris and soil into a huge concrete dome called the Runit Dome, which sits on Enewetak Atoll and houses 88,000 square metres of contaminated soil and debris.It has recently received media attention as it appears to be leaking, due to cracking and the threat from rising sea levels, while some Marshallese have fears it may eventually collapse.

However, American officials have said it’s not their problem and responsbility falls on the Marshallese, as it is their land.

The US has cited a 1986 compact of free association, which released the US goverment from further liability, which will go up for renegotiation in 2023.

Meanwhile, the Marshallese continue to campaign for adequate compensation from the US.

While he said that suggestions that the Rumit Dome – nicknamed “The Tomb” by locals – was about to collapse were alarmist, there were still major concerns surrouding it.

“The issue is it’s got plutonium, which has a half-life of 24,000 years, and how long does concrete last?”

Describing the structure as a “symbol of the nuclear legacy here”, Johnson said that US government scientists had reported there was already so much contamination in the area that it would be difficult to find what leakage from the dome had added.

The United States has continued to refuse to accept responsibility for the Runit Dome’s condition, despite its history of nuclear testing in the country.

“The nuclear weapons test legacy is the overriding issue in the Marshall Islands with the United States and it remains a festering problem, because US compensation and medical care and so forth was only partial for what was needed,” Johnson said.

The first compact to free association between the Marshall Islands and the US contained a compensation agreement, including the establishment of a nuclear claims tribunal to adjudicate all claims. While it determined there was a large amount of compensation due to Marshallese on various atolls, this has never been paid out, apart from funding of $150 million in 1986.

Since then, the US has accepted no more liability on nuclear compensation, as the compact resulted in the Marshall Islands being an independent country, able to join the United Nations.

However, Johnson said the United States Congress had taken a different position on this.

There have also been big differences in the treatment of Marshallese nuclear victims and those in the United States

“The US used Bikini and Enewetak to test its biggest hydrogen bombs,” Johnson said. “While it maintained a nuclear test site in Nevada, it only tested relatively small nuclear devices there, because it simply could not test hydrogen bombs in the continental United States – Americans wouldn’t have stood for it.”

Not long after the 1986 free association compact ended American responsibility for nuclear compensation in the Marshall Islands, the US Congress enacted a radiation compensation act for Americans – which Johnson said really emphasised the unfairness of the situation.

“Long story short, they appropriated $100 million and then they ran out, the US congress appropriated more, again ran out, appropriated more and fast-forward to 2020 and they’re over $2 billion in compensation awarded to American nuclear victims.

Johnson also had concerns about the lack of a baseline epidemiological study by the US, following the tests. Studies on the affects of radiation centred around thyroid issues, but many islanders have reported cancer, miscarriages and stillbirths in the years following.

His wife Darlene Keju died of breast cancer, which also affected her mother and father – she grew up on one of the islands in the downwind zone of the tests.

The US had never looked at rates of cancer, or studied the differences between low fallout and high fallout areas, he said.

Johnson hoped the nuclear legacy between the countries could be worked out amicably, but he wasn’t too optimistic.

Despite this tension, Johnson said the Marshallese did not harbour anti-American sentiment and the compensation issues were a “black mark on an otherwise good relationship” between the two countries.

He said around 30 to 40 percent of all Marshallese were living in the US.

“The Marshall Islands, since WWII, has a very long standing high regard and strong relationship with the US that came out of the end of the Japanese period of militarism and the execution of many islanders and privation, into a period where the US fostered democratic institutions, created opportunities for education, providing scholarships, opening the door to people going to the US and the unpacked treaty really put this together, in terms of the relationship that’s of benefit to both sides.”

However, ongoing tensions between the US and China may help the Marshall Islands in their push for further compensation.

“Possibly the changing geopolitical situation out here might offer an opening to get some interest to try to amicably do something to resolve the whole thing,” Johnson said.

But the nuclear legacy is not the only issue affecting the island – climate change is looming large and reports by US scientists have said that the Marshall Islands could be uninhabitable by the 2030s, due to rising sea levels.