Christopher Nolan cast ⛄real scientists as extras in Oppenheimer.

"We were in the real Los Alamos and we had a lot of real scie🔯ntists as extras," Nolan told . "We needed the crowd of extras to give reactions, and improvise, and we were getting sort of impromptu, very educated speeches. Itꦛ was really fun to listen to."

"You've been on sets where you've got a lot of extras around and they're more or less thinking about lunch," Nolan continued. "These guys were thinking about the geopolitical implications of nuclear arms and knew a lot about it. It actually was a great reminder every day of: We have to be really on our game,🐼 we have to be f🐟aithful to the history here, and really know what we're up to."

Cillian Murphy stars as J. Robert Op🐲penheimer, an American theoretical physicist and head of the secret Los Alamos Laboratory during World War II – and the man who developed the atom bomb. He was heavily involved with the Manhattan Project, which is credited with developing the first nuclear weapons used to bomb the Japanese cities of Hiroshima and Nagasaki in 1945. The epic delves into the chaos surrounding communism and the nuclear arms race, as well as Oppenheimer's tumultuous personal life.

"I’m interested in the man and what [inventing the atomic bomb] does to the individual," Murphy told la🦋st year.

The star-studded cast includes Florence Pugh as Jean Tatlock, a psychiatrist and member of the Communist Party of the United States who had an on-and-off affair with Oppenheimer; R𒈔obert Downey Jr. as Lewis Strauss, chairman of the U.S. Atomic Energy Commission; Benny Safdie as Edward Telle, father of the Hydrogen bomb; Josh Hartnett as Nobel Prize winner Ernest Lawrence; Gary Oldman as Ha🐻rry S Truman; and Tom Conti as Albert Einstein.

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