Fans awaiting the release of one of the most eagerly anticipated films of the year—Christopher Nolan's Oppenheimer—were in for a surprise on Monday. A new trailer gives a sneak peek into the life and mind of American physicist, J. Robert Oppenheimer, who is called the father of the atomic bomb.

The film revolves around the controversial Manhattan Project which led to the development of the world's first nuclear weapon during World War II. The trailer introduces a stellar star cast including Cillian Murphy, Emily Blunt, Matt Damon, Robert Downey Jr., Florence Pugh among other who play characters inspired by real-life persons . The three-minute trailer begins with Oppenheimer (Murphy) saying: “This is a national emergency”. In another shot, Damon who essays the project director Lt. Gen. Leslie Groves says:"This is the most important thing to ever happen in the history of the world.”

Nolan, known for his epic visual style, promises an unbelievable big screen experience with Oppenheimer too. The writer-director who teamed up with Oscar-nominated filmmaker Hoyte van Hoytema sticks to his grandiose style by using Imax cameras and stark black-and-white cinematography, the Hollywood Reporter stated.

In a particularly powerful sequence in the trailer, Groves and Oppenheimer push that button to test the bomb even as they discuss a chance it 'might destroy the world'. Speaking about it recently, Nolan said: “I wanted to take the audience there. To do so, I've assembled the most incredible cast and the finest technicians.”

The biopic will hit the big screens on July 21. 

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