Christopher Nolan has never been one to take the easy or straightforward route while

He shoots on large-format film with large, cumbersome cameras to get the best possible cinematic image. He prefers practical effects over computer-generated ones and real locations over soundstages 鈥� even when that means recreating an atomic explosion in the harsh winds of the New Mexico desert in the middle of the night

Though, despite internet rumors, they did not detonate an actual nuclear weapon.

And as for the biography that inspired his newest film, Kai Bird and Martin J. Sherwin鈥檚 riveting, linear narrative 鈥淎merican Prometheus鈥� was simply the starting point from which Nolan crafted a beguiling labyrinth of suspense and drama.

It鈥檚 why, in his two decades working in Hollywood, Nolan has become a franchise unto himself 鈥� the who makes films that are both intellectually stimulating and commercial, accounting for more than $5 billion in box office receipts. That combination is part of the reason why he鈥檚 able to attract Oscar winners and movie stars not just to headline his films, but also to turn out for just a scene or two.

鈥淲e鈥檝e all been so intoxicated by his films,鈥� said who plays J. Robert Oppenheimer鈥檚 wife, Kitty. 鈥淭hat exploration of huge themes in an entertaining way doesn鈥檛 happen. It just doesn鈥檛 happen. That depth, the depth of the material, and yet on this massive epic scale.鈥�

In the vast and complex story of the brilliant theoretical physicist who oversaw and the development of the atomic bomb during World War II, Nolan saw exciting possibilities to play with genre and form. There was the race to develop it before the Germans did, espionage, romance, domestic turmoil, a courtroom drama, bruised egos, political machinations, communist panic, and the burden of having created something that could destroy the world.

And then there was the man himself, beloved by most but hated by enough, who, after achieving icon status in American society, saw his by the very institutions that built him.

鈥淚t鈥檚 such an ambitious story to tell,鈥� said who plays Gen. Leslie Groves Jr. 鈥淩eading the script, I had the same feeling I had when I read 鈥業nterstellar,鈥� which was: 鈥楾his is great. How the hell is he going to do this?鈥欌��

It鈥檚 not so disconnected from Nolan鈥檚 other films, either. As critic Tom Shone noted in his book about the director, 鈥淟ooked at one way, Nolan鈥檚 films are all allegories of men who first find their salvation in structure only to find themselves betrayed or engulfed by it.鈥�

Nolan to take on the gargantuan task of portraying Oppenheimer. in five Nolan films, including the Batman trilogy, 鈥淒unkirk鈥� and 鈥淚nception,鈥� but this would be his first time as a lead 鈥� something he had secretly pined for.

鈥淵ou feel a responsibility, but then a great hunger and excitement to try and do it, to see where you can get,鈥� said Murphy, who prepped extensively for six months before filming, working closely with Nolan throughout. 鈥淚t was an awful lot of work, but I loved it. There is this kind of frisson, this energy when you鈥檙e on a Chris Nolan set about the potential for what you鈥檙e going to achieve.鈥�

It would be an all-consuming role that would require some physical transformation to approximate that famously thin silhouette. A complex, contradictory figure, Oppenheimer emerged from a somewhat awkward youth to become a renaissance man who seemed to carry equal passion for the Bhagavad Gita, Proust, physics, languages, New Mexico, philosophical questions about disarmament and the perfectly mixed martini. But Murphy knew he was in safe hands with Nolan.

鈥淗e鈥檚 the most natural director I鈥檝e ever worked with. And the notes that he gives to an actor, are quite remarkable. How he can gently bring you to a different place with your performance is quite stunning in such a subtle, low-key, understated way,鈥� Murphy said. 鈥淚t can have a profound effect on the way you look at a scene from one take to another take.鈥�

Nolan wrote the main timeline of the film in the first person, to represent Oppenheimer鈥檚 subjective experience.

鈥淲e want to see everything through Oppenheimer鈥檚 point of view,鈥� Nolan said. 鈥淭hat鈥檚 a huge challenge for an actor to take on because they鈥檙e having to worry about the performance, the truth of the performance, but also make sure that that鈥檚 always open to the audience.鈥�

The other timeline, filmed in black and white, is more objective and focused on Lewis Strauss (Robert Downey Jr.), a founding member of the Atomic Energy Commission and a supporter of the development of the more destructive hydrogen bomb.

鈥淥ppenheimer鈥� is Nolan鈥檚 first R-rated film since 2002鈥檚 鈥淚nsomnia,鈥� which after years of working exclusively in PG-13, he鈥檚 comfortable with. It fits the gravity of the material.

鈥淲e鈥檙e dealing with the most serious and adult story you could imagine 鈥� very important, dramatic events that changed the world and defined the world we live in today,鈥� Nolan said. 鈥淵ou don鈥檛 want to compromise in any way.鈥�

Much of the filming took place in New Mexico, including at where thousands of scientists, technicians and their families lived and worked for two years in the effort to develop the bomb. Nolan enlisted many of his frequent behind-the-scenes collaborators, including his wife and producer cinematographer composer and special effects supervisors Scott Fisher and Andrew Jackson, as well as some newcomers like and to help bring this world to life.

鈥淚t was a very focused set 鈥� fun set as well, not too serious. But the work was serious, the sweating of the details was serious,鈥� Blunt said. 鈥淓veryone needs to kind of match Chris鈥� excellence, or want to.鈥�

When it came to Oppenheimer鈥檚 chosen name for art and life blended in a visceral way.

鈥淲e wanted to put the audience there in that bunker,鈥� Nolan said. 鈥淭hat meant really trying to make these things as beautiful and frightening and awe inspiring as they would have been to the people at the time.鈥�

Though no real nukes were used, they did stage a lot of real explosions to approximate the blindingly bright atomic fire and mushroom cloud.

鈥淭o do those safely in a real environment out in the nighttime desert, there鈥檚 a degree of discipline and focus and adrenaline and just executing that for the film that echoes and mirrors what these guys went through on the grandest scale in a really interesting way,鈥� Nolan said. 鈥淚 felt everybody had that very, very tight sense of tension and focus around all those shooting nights.鈥�

The weather also 鈥渄id what it needed to do, as per history,鈥� Murphy said, as the wind picked up and whipped around the set.

鈥淚鈥檓 rumored to be very lucky with the weather and it鈥檚 not the case. It鈥檚 just that we decide to shoot whatever the weather,鈥� Nolan said. 鈥淚n the case of the Trinity test, it was essential, central to the story that this big storm rolls in with tremendous drama. And it did. That really made the sequence come to life.鈥�

He added: 鈥淭he extremity of it put me very much in the mindset of what it must have been like for these guys. It really felt like we were out in it.鈥�

Then, of course, there is the experience of watching 鈥淥ppenheimer.鈥�

鈥淲hen you鈥檙e making a movie, I feel like you鈥檙e on the inside looking out,鈥� Blunt said. 鈥淚t鈥檚 really overwhelming to see it reflected back at you, especially one of this magnitude. 鈥� I just felt like my breastplate was going to shatter, it was so intense.鈥�

The hope is that when 鈥淥ppenheimer鈥� is unleashed on the world, audiences will be as invested and . The film has a run in IMAX theaters around the country, not something often afforded serious-minded, R-rated movies in the middle of But this is also the essential Nolan impossibility.

As more and more auteurs have had to compromise 鈥� to either go smaller or team with streamers to get the kind of budget they might once have had at studios, like even and have had to do this year 鈥� Nolan continues to make his movies on the grandest scale.

鈥淓ach of his films has been revolutionary in their own way,鈥� Murphy said. 鈥淚t鈥檚 an event every time he releases a film, and rightly so.鈥�

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