Inside 'nuke school', the elite US training ground preparing Australian submariners for an AUKUS future
In America's deep south, a group of students has just completed one of the most rigorous academic programs in the US military.
And for the first time, there were Australians among them.
Three members of the Royal Australian Navy have graduated from the Nuclear Power School in South Carolina, more commonly known as 'nuke school'.
The training pipeline was established with the US as part of the AUKUS agreement, under which Australia will obtain its own nuclear-powered submarines.
"It's a historic event for our Navy, an historic event for our submarine force and I think it's an historic event for our nation," said Australia's Chief of Navy, Vice Admiral Mark Hammond.
"Two years ago, this wasn't on the radar.
"And we've come a long way in such a short period of time but there's a lot more work to do."
Years out from Australia's acquisition of nuclear-powered subs, the graduation is an early step towards making AUKUS a reality.
But there are still major hurdles ahead when it comes to the broader workforce challenges presented by the plan.
The three Australians — Lieutenant Commander James Heydon, Lieutenant Commander Adam Klyne, and Lieutenant William Hall – started at the Nuclear Power School in November with the aim of eventually qualifying to operate the reactors onboard nuclear-powered submarines.
Lieutenant Commander Heydon described the course he's just graduated from as a "four-year engineering degree crammed into six months".
"Maths, physics, thermodynamics, fluid dynamics, radiological controls, to how do we safely steward and manage the nuclear plant and the nuclear by-products, are I guess aspects of what we've been learning here," he said.
"My experience [in the Australian Navy] was ship design and ship construction.
"While they were aspects here, it was very foreign. So it was … a crash course into the deep end, sink or swim, and we all swam."
The Australians will now have to complete another set of practical learning, which will include spending time on retired nuclear-powered subs known as moored training ships.
After that, they'll receive further training in Connecticut before being assigned to a Virginia-class sub.
"The plan at this stage is to join submarines based in Pearl Harbor, Hawaii, and they'll complete their training at sea," Vice Admiral Hammond said.
"Ultimately, we need them to pay their skills forward.
"So once they're qualified, sufficiently experienced, then we'll get them back into the ecosystem in a different role."
The AUKUS plan, announced in San Diego earlier this year, will see Australia acquire a total of eight nuclear-powered submarines at a cost of up to $368 billion. 
US submarines are increasing their visits to Australian ports from this year, and from 2027 HMAS Stirling naval base in Western Australia will host rotations of American and British subs under what's known as 'Submarine Rotational Force-West'.
Australia is expected to buy at least three Virginia-class submarines from the US from the early 2030s, before building its own nuclear-powered boats in Adelaide to be known as SSN-AUKUS.
They will be based on a British design using US technology, with the first scheduled to be delivered in the early 2040s.
The final details of Australia's first nuclear submarine fleet have been unveiled — along with the price tag. 
Retired submariner and senior fellow at Washington-based think tank the Hudson Institute, Bryan Clark, described it as a "crawl, walk, run" approach.
"The biggest challenge is going to be transitioning from having some Australian-owned, US-built submarines … to having an Australian-built or at least a purpose-built Australian nuclear submarine," he said.
"It's going to require a massive amount of infrastructure, incredible workforce demand, both in terms of technical skills and numbers.
"It just seems like that's going to be a pretty heavy lift on the part of Australia to do nuclear ship construction."
The federal government says AUKUS will create 20,000 jobs over 30 years across the Australian Defence Force, the public service and industry, including roles such as tradespeople, engineers and project managers.
The number of Australian submariners will also need to be increased, with nuclear-powered submarines carrying larger crews and requiring personnel trained to operate the reactor onboard.
"The submariners that come out of Australia are very smart, very capable, fully able to take on that challenge of becoming nuclear plant operators," said Mr Clark, who is also a former executive officer of one of the moored training ships in Charleston.
"The difficulty might be in getting the numbers that you need to be able to man a nuclear submarine."
Virginia-class submarines carry around 132 people, nearly three times the size of the crew onboard the Collins-class boats Australia has now.
And unlike the Collins, nuclear-powered subs do not need to surface regularly to recharge, meaning they can stay submerged for months at a time.
Vice Admiral Hammond acknowledged the scale of the task confronting the Navy.
"We were already focused on recruiting, increasing the size of the submarine force and then initially bleeding across in smaller numbers into the nuclear power program and then scaling up as we go," he said.
"So it's a complex challenge, especially given the workforce environment back in Australia.
"Every company, every organisation wants talent. So we'll be focused very, very clearly on recruiting and retaining."
More Australians are expected to follow in the footsteps of the first three graduates in Charleston, while Navy personnel are also training in the UK.
But Vice Admiral Hammond said Australia could eventually host its own training program.
"I think if we're serious about developing a sovereign nuclear submarine capability, then in time, definitely, all parts of the ecosystem built and operated by Australians in Australia, that should be the aim point," he said.
"But we don't need it all at once."
Asked where it could be located, he said the "sensible approach" would be either Adelaide or Perth.
The new subs will be built in South Australia, while Western Australia's HMAS Stirling is undergoing an $8 billion expansion.
"They will be the two centres of excellence, if you like, for naval nuclear propulsion in Australia," Vice Admiral Hammond said.
"If you cast our minds forward, probably another 10, 15, 20 years, then the majority of the nuclear-trained submariners will be in the home port of the submarine force.
"There'll be a large number in Adelaide, but most of the boats won't be in Adelaide. So through that lens, probably WA.
"But that's a decision for governments and probably a decision for next decade, I'd imagine."
Aside from skills and workforce issues, there are other major challenges that still need to be overcome to bring AUKUS to fruition.
The sale of Virginia-class submarines to Australia requires the approval of the US Congress, and significant changes are needed to a complex set of export controls restricting how sensitive technology is transferred.
Questions also remain over how the US will deliver the promised Virginia-class submarines, given the pressure its own shipyards are under to meet local demand.
The US Chief of Naval Operations, Admiral Michael Gilday, last month said it was "too early" to provide an answer on exactly where the subs would come from.
"I wouldn't expect them to start identifying submarines by name or by hull number just yet; we've got time to work through that," Vice Admiral Hammond said.
"But at the moment, there is a deep tripartite commitment to doing this."
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