Sydney Sweeney Says It Was 'Terrifying' to Film in Real Catacombs for Immaculate (Exclusive)

"You only could be down there for so many minutes because of the air quality," the actress says of filming 'Immaculate' inside real underground passagewaysBenjamin VanHoose is an Associate Editor on the Movies team at PEOPLE. He has written about entertainment and breaking news for over five years.In the film, the actress plays Cecilia, a devout American nun who moves to a convent in Italy, quickly uncovering a sinister side of the religious community.

Sweeney, 26, tells PEOPLE that wearing the nun costume was "comfy," except "the habit was probably the most uncomfortable piece of the wardrobe. It would crush your ears in a weird way. But everything else was great." Then, however, came the fake blood. "It is very sticky, and it's usually cold," says the actress. "The worst is getting it put on you, but then after a while you're fine. You forget that you have it on."PEOPLE's free daily newsletter

to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Sweeney — who says, in her own life, her fears are "clowns and needles" — explains it's not difficult for her to shift out of that dark mind set between takes."It's an easy on-and-off switch," says Sweeney. "I learned from an early age that it's important to separate myself from my characters as much as possible.

"Also, we're not really lingering on those shots very long, but they really do lodge into your brain in a way that— you just can't unsee some of the imagery in this film."Trailer: Zachary Levi's Drawings Become Real in Children's Book Adaptation Smile 2's Maria Says Beef with Lea and Sydney Is 'Squashed' but Jess Drama Remains: 'To Be Continued'

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