Admiral George Dufek described the moment as “a dramatic new era in man’s conquest of the remotest continent”. The US administration was certain the reactor did not violate the Antarctic Treaty’s declaration that “any nuclear explosions in Antarctica and the disposal there of radioactive waste material shall be prohibited”.

Within a year, Nukey Poo caused its first fuss, a hydrogen fire in a containment tank that led to a shutdown and energy shortages. Icebreakers fought to break through and fuel for generators was delivered by helicopter, which burned as much as they delivered over the course of a flight. Over the following years, Nukey Poo proved so unreliable and expensive to maintain that the military gave up hopes of using the technology to displace diesel at other remote locations.

In 1972, the navy began the three-year task of decommissioning the reactor and decontaminating the site. During that process, they discovered corrosion that technicians feared may have caused leaks of irradiated material. No detailed investigation was done. The secretary of the US National Academy of Sciences said the program was ended due to a series of malfunctions and the possibility of leaks, the Bulletin of the Atomic Scientists reported. The New Zealand government declared the decision was economic.

Either way, it was decided not only to remove the reactor, but half the hillside it was built into. Eventually 12,000 tonnes of irradiated gravel and soil was removed on supply ships to be buried in concrete lined pits in the United States.

The young Australian scientist, Dr Howard Dengate, who had run one of the NZ bases, hitched a lift on one those ships, the Schuyler Otis Bland, in 1977. Dengate recalls a grumpy captain who once swore at him for inviting bad luck on the ship by whistling on deck. The captain, Dengate recalled this week, blamed him for “whistling up” the storm that struck the vessel before the Australian disembarked in New Zealand and the ship sailed on to the US.

Though the reactor was little discussed in the wider world, no secret was made on the base of the reactor or its impact. Indeed, Dengate recalled finding an operating manual for the reactor in the American rubbish pits that New Zealanders had developed the habit of fossicking in.

But the story did not end there.

In 2011, an investigation by journalists of News 5 Cleveland found evidence that McMurdo personnel were exposed to long-term radiation, and in 2017 compensation was paid to some American veterans of the base. A year later, New Zealand officials announced that it was possible that New Zealand staff were also affected.

It has since been reported that four New Zealanders had raised claims about their ill health since their time in the Antarctic.

In 2020, the Waitangi Tribunal, a permanent commission in New Zealand to investigate cases against the Crown, launched inquiries. They are not yet complete.

Asked if he was concerned about travelling with the irradiated material, Dengate said he was not. “We were young and dumb and adventurous,” he told this masthead of his time in the Antarctic.

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