The Manhattan Project, set up during the Second World War in 1942, was guided by fear that if the US and its allies didn’t make them first, Hitler’s Nazi scientists would.
A left-wing theoretical physicist not known for his leadership qualities or laboratory acumen, the American was an unconventional pick but proved a devastatingly effective one.
As blockbuster biopic Oppenheimer hits cinemas, Sky News looks at how the father of the atomic bomb still shapes the world decades after his creation was deployed.
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0:52
Oppenheimer film ‘puts audience in bunker’
An unusual recruitment
Oppenheimer was appointed by General Leslie Groves, the project’s military leader, to head up Site Y – a secret weapons research facility at Los Alamos, New Mexico.
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But there were, as Oppenheimer biographer Professor Ray Monk puts it, “all sorts of reasons” not to appoint him, notably perceived association with communist organisations that had made him a suspect of the FBI.
Born to a Jewish family in New York in 1906, his student years had seen him drawn to the left as Germany’s fascist regime saw friends and relatives oppressed and forced to flee.
During studies at Harvard, Cambridge, and Germany‘s Gottingen university in the 1920s, he was known for being a “disaster in the laboratory”. Of his time studying physics at Harvard, Oppenheimer himself said: “My feeling about myself was always one of extreme discontent.”
He may have been unconvincing in the lab, but found his calling as a university lecturer in California. His ability to explain complex science in a relatively straightforward and compelling way proved key to impressing Groves, who interviewed countless scientists before a chance meeting with Oppenheimer.
Crucially, he also recognised the need for urgency.
Prof Monk says: “Oppenheimer knew Heisenberg, one of the greatest scientists in the world, who he worked with at Gottingen, was leading the Nazi bomb project and was worried they would get one before the Allies.
“He was in no doubt at all – the duty of all scientists in the US, and the allied countries, was building a bomb first.”
Building the bomb
Los Alamos was one of three sites critical to the development of the atomic bomb.
The others were a factory in Hanford, Washington, where plutonium was made; and a hidden base in Oak Ridge, Tennessee, for enriching uranium.
The basis of the atomic bomb is the process of nuclear fission – when the nucleus of an atom is split into two smaller nuclei, releasing a large amount of energy in the process.
This was discovered in 1938 by two German scientists, and Oppenheimer realised its destructive potential when word reached him in 1939.
The prospect of weaponising nuclear fission focused the minds of scientists across Europe, with plutonium and uranium identified as elements that could undergo the process.
With the process understood, the race was on to weaponise it.
Cynthia C Kelly is founder and president of the Atomic Heritage Foundation, dedicated to the preservation of the Manhattan Project and crucial to having the three sites gain national park status in the US.
“It was a first-of-a-kind effort across the board,” she says of the Manhattan Project, named after the New York City district where it was founded.
With the city that never sleeps deemed too busy for such a secretive initiative, the three laboratories were set up in isolated places far away from urban centres and the coast. They brought together geniuses from across America and overseas – including Britain and some who fled Nazi Germany – into one single-minded pursuit.
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“It required creative minds from the machinists to the craftsmen – everything had to be perfect,” Kelly adds, with a “classic absent-minded professor” at the heart of it.
“They had to take this energy, which had been uncontrolled up to now, figure out how to control it, and package it tightly enough to fit in the bomb bay of an aeroplane that could transport it and drop it.
“They had little confidence in harnessing this technology in time for the end of the war.”
Becoming Death
But harness it they did – and the world would change forever.
The first atomic bomb test in New Mexico happened on 16 July 1945, after which Oppenheimer uttered a line that, along with his trademark fedora and pipe, has become quintessential to his public image.
“Now I am become Death, the destroyer of worlds,” he observed after the so-called Trinity Test, quoting a sacred Hindu text in a reminder of his acumen as a philosopher as well as a scientist.
A few weeks after, death followed on an unimaginable scale. On 6 August, a uranium-based bomb named Little Boy was detonated over Hiroshima; and another, Fat Man, was dropped on Nagasaki three days later.
Both cities were left unrecognisable, 200,000 people died, and Japan surrendered. Oppenheimer was shaken.
“Right up until the dropping of the bomb on Hiroshima, he had no moral qualms whatsoever,” says Prof Monk.
“Even when the Germans surrendered (on 7 May 1945), and it was obvious the Americans were still going to use the bomb against the Japanese, he had no qualms.
“But he thought one demonstration of the awesome power of this weapon was enough.”
A new world
Despite its undoubted role in ending the Second World War, which cost the lives of some 90 million people, Oppenheimer was changed by the atomic bomb, believing it made the prospect of future conflict “unendurable”.
“It has led us up those last few steps to the mountain pass; and beyond there is a different country,” he said in 1946, later signalling his opposition to his government’s plan to develop even bigger nuclear weapons.
Oppenheimer was ignored and held in deep suspicion, and his security clearance at the Atomic Energy Commission eventually rescinded. He died of lung cancer in 1967 with none of the power he once yielded.
Nuclear weapons have not been used again, but the threat lingers. America and Russia’s arsenals are far smaller than their Cold War peak, but they hold 90% of an estimated global stockpile of 13,000 weapons.
Ever since Oppenheimer witnessed the Trinity Test in the New Mexico desert, Cynthia C Kelly says there’s been “no way to put the genie back in the bottle”.
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Two cities devastated beyond recognition have seemingly served as the ultimate deterrence.
“Oppenheimer was invited to say he regretted developing the atomic bomb many times, most prominently when he visited Japan, and his answer was always no,” says Prof Monk.
“It can be argued the fact the weapons have never been used again shows deterrence works.”
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2:39
Will Russia use nuclear weapons?
Beyond deterrence, the Manhattan Project also unleashed an era of science and innovation still being felt today, including nuclear energy vital to weaning ourselves off greenhouse gases.
It was the first time a US president had been convicted of or charged with a criminal offence.
Trump had tried to cover up “hush money” payments to a porn star in the days before the 2016 election.
When Stormy Daniels‘ claimsof a sexual liaison threatened to upend his presidential campaign, Trump directed his lawyer to pay $130,000 (£102,000) to keep her quiet.
The payment buried the story and he later won the presidency.
Trump denied the charges and said the case was politically motivated. He also denied the sexual encounter took place.
New York State Supreme Court Justice Juan Merchan today delayed the sentencing, which had been due to take place on Tuesday.
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The office of district attorney Alvin Bragg had asked the judge to postpone all proceedings until Trump finishes his four-year presidency, which starts on 20 January.
Trump’s lawyers say the case should be dismissed because it will create “unconstitutional impediments” to his ability to govern.
Responding to Friday’s decision, a Trump campaign spokesman said: “The American People have issued a mandate to return him to office and dispose of all remnants of the Witch Hunt cases.”
The judge set a 2 December deadline for Trump’s lawyers to file their motion, while prosecutors have until 9 December to respond.
He did not set a new date for sentencing or indicate when he would rule on any motion to throw out the case.
Even before Trump’s win in this month’s election, experts said a jail term was unlikely and a fine or probation more probable.
But his resounding victory over Kamala Harris made the prospect of time behind bars or probation even less likely.
Trump, 78, was also charged last year in three other cases.
One involved him keeping classified documents after he left office and the other two centre on alleged efforts to overturn his 2020 election loss.
A Florida judge dismissed the documents case in July, the Georgia election case is in limbo, and the Justice Department is expected to wind down the federal election case as it has a policy of not prosecuting a sitting president.
Trump last week nominated his lawyers in the hush money case, Todd Blanche and Emil Bove, for senior roles in the Justice department.
When he re-enters the White House, Trump will also have the power to shut down the Georgia and New York cases.
Donald Trump has pledged for years to surround himself with ultra-loyalists who can mould his government to his vision without barriers.
That’s precisely why he picked Matt Gaetz. Now he’s out, Pam Bondi is in and she’s equally loyal.
Gaetz was uniquely unpopular on Capitol Hill but ultra-MAGA and ultra-loyal to the president-elect.
He was chosen by the president-elect to do his bidding inside the Justice Department as attorney general.
Critics called his pick “a red alert moment for democracy” and the man a “gonzo agent of chaos” – language that would surely only affirm Trump’s decision in his own proudly disruptive mind.
If it wasn’t for the fact that the president-elect is himself a convicted felon, and a man found liable in a civil court of his own sexual offences, the prospect of Gaetz, with all his baggage, making it through the nomination process would have seemed remote.
But Donald Trump’s return to the White House suggested anything is possible.
And so, beyond his loyalty, Gaetz was Trump’s test for his foot soldiers on Capitol Hill. How loyal were they? Would they wave through anyone he appointed?
It turns out that Gaetz, and the storm around his private life, was too much for a proportion of them.
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At least five Senate Republicans were flatly against Matt Gaetz’s confirmation. We understand that they communicated to other senators and those close to Trump that they were unlikely to be swayed.
They included the Republican old guard like Senator Mitch McConnell.
Beyond the hard “no” senators, there were between 20 and 30 other Republicans who were very uncomfortable about having to vote for Gaetz on the Senate floor.
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2:23
Trump pick Matt Gaetz withdraws
The key question is whether Gaetz was Trump’s intentional wild card crazy choice that he knew, deep down, would probably never fly.
Was Gaetz the candidate he had accepted would be vetoed by senators – who would then feel compelled to wave the rest of his nominees through?
Will Pete Hegseth’s alleged sexual impropriety concern them as they consider the suitability of the former Fox News host and army major to run the Department of Defence?
What about Tulsi Gabbard, the candidate Russian state TV calls ‘our girl’, and the appropriateness of her running America’s intelligence agencies?
These are all appointments that the politicians on Capitol Hill must consider and confirm in the weeks ahead.
We don’t yet know who Trump will choose to direct the FBI.
There are some names being floated which will make the establishment of Washington shudder but then that’s precisely why Trump was elected. He is the disrupter. He said so at every rally, on repeat.
He was quick to pivot to another name to replace Gaetz.
Bondi is the former attorney general of Florida. Professionally she is in a different league to Gaetz. She’s been a tough prosecutor, with a no-nonsense reputation.
She is also among the most loyal of loyalists. Her attachment to Trump stretches way back.
I first came across her in Philadelphia in November 2020 when she was among Trump surrogates claiming the election back then had been stolen from them by Joe Bidenand the Democrats.
She was a key proponent of the false claims the election had been rigged and Trump was the rightful winner.
The court cases concluding that was all nonsense didn’t seem to convince her.
Now she is poised to head up the Department of Justice as the country’s top law enforcement official.
Within hours of taking office, president-elect Donald Trump plans to begin rolling out policies including large-scale deportations, according to his transition team.
Sky News partner network NBC News has spoken with more than half a dozen people familiar with the executive orders that his team plans to enact.
One campaign official said changes are expected at a pace that is “like nothing you’ve seen in history”, to signal a dramatic break from President Joe Biden’s administration.
Mr Trump is preparing on day one to overturn specific policies put in place by Mr Biden. Among the measures, reported by sources close to the transition team, are:
• The speedy and large-scale deportations of illegal immigrants
• Ending travel reimbursement for military members seeking abortion care
• Restricting transgender service members’ access to gender-affirming care
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But much of the first day is likely to focus on stopping illegal immigration – the centrepiece of Trump’s candidacy. He is expected to sign up to five executive orders aimed at dealing with that issue alone after he is sworn in on 20 January.
“There will without question be a lot of movement quickly, likely day one, on the immigration front,” a top Trump ally said.
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“There will be a push to make a huge early show and assert himself to show his campaign promises were not hollow.”
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2:23
Donald Trump ally Matt Gaetz has withdrawn his name from consideration to be the next US attorney general.
But Mr Trump’s campaign pledges also could be difficult to implement.
Deporting people on the scale he wants will be a logistical challenge that could take years. Questions also remain about promised tax cuts.
Meanwhile, his pledge to end the war between Russia and Ukraine in just 24 hours would be near impossible.
Even so, advisers based at Mr Trump’s Mar-a-Lago resort or at nearby offices in West Palm Beach, Florida, are reportedly strategising about ending the wars in Ukraine and the Middle East.
Following his decisive victory on 5 November, the president-elect has moved swiftly to build a cabinet and senior White House team.
As of Thursday, he had selected more than 30 people for senior positions in his administration, compared with just three at a similar point in his 2016 transition.
Stephen Moore, a senior economic adviser in Mr Trump’s campaign, told NBC News: “The thing to realise is Trump is no dummy.
“He knows he’s got two to three years at most to get anything done. And then he becomes a lame duck and we start talking about [the presidential election in] 2028.”