After months of speculation about his role in the movie, he finally made his first appearance on the filming set of the movie, reported Ace Showbiz.
Several images offer first glimpse of the British actor hopping into the pilot's seat of a replica British spitfire.
The "Mad Max: Fury Road" actor is seen dressing in an ensemble reminiscent of a RAF fighter pilot and combining it with a dark jacket, goggles and a helmet.
Earlier this month, Warner Bros teased fans with the first teaser trailer of the upcoming thriller despite the film being in the early stage of production.
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"Dunkirk" revolves around allied soldiers from Belgium, Britain and France who are surrounded by the German army and evacuated during a fierce battle in World War II.
The upcoming film has tapped Fionn Whitehead as the main character and Harry Styles in a mystery role.
Nolan directs the film from a script he wrote. He also serves as producer along with his wife Emma Thomas. Also starring Mark Rylance and Kenneth Branagh, the epic action thriller hits US theaters on July 21, 2017.