In the sequence where the Spitfire ditches into the English Channel, an IMAX camera was strapped into the cockpit to film Collins (Jack Lowden) trying to get out. However, during filming, the plane with the camera still inside sank quicker than predicted. It took so long to retrieve the plane, that the IMAX camera housing filled with water, potentially ruining the expensive camera and the film inside. Cinematographer Hoyta Van Hoytema used an old movie technique of keeping the film wet, and shipped it back to Los Angeles, getting it processed before it dried out. The take from that scene is in the movie.

Film

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