The British-American director has dozens of well-known titles under his belt, including Memento, The Dark Knight trilogy and Inception.

He’s currently promoting forthcoming sci-fi film Interstellar, about a group of space travellers searching for a habitable planet.

And while joining The Hollywood Reporter for a discussion with the feature’s stars, including Matthew McConaughey and Anne Hathaway, Christopher admitted he’s currently entrenched in “unquestionably” the part of filmmaking he finds most challenging.

“I'm not being glib,” he told the trade outlet. “I actually find the process of bringing the film out to the audience the most difficult, definitely. All of the other challenges — you have time, you have various resources. You have things you can throw yourself into. As you come to the end of the project, you run out of things you can tweak and change,” he explained.

Interstellar already has high expectations to live up to. The film, slated for US release November 5, is already getting Oscar buzz, as THR notes.

In addition to stars Matthew and Anne, Jessica Chastain, Casey Affleck and Michael Caine have supporting roles.

The screenplay was initially penned by Christopher’s brother, Jonathan, with Steven Spielberg in mind to direct.

And regardless of the certain difficulty ahead of bringing yet another film before an audience, Christopher said he “didn’t hesitate” when he “saw the opportunity to get involved” with another sci-fi project.

“One of my earliest movie memories is my dad taking me to see 2001 in [London's] Leicester Square on the big screen,” he said of his connection to the genre. “It was such an extraordinary feeling: to be taken off this planet and to the furthest reaches of the universe.

“It has really been an ambition of mine: If I ever had the opportunity to get involved in a large-scale science fiction project, something about exploring our universe, I would try to seize the opportunity,” he said.

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