Director Kathryn Bigelow shot the highly-anticipated epic surrounding the U.S. manhunt for terrorist leader Osama bin Laden in India and Jordan, where local women are required to cover up to adhere to strict religious beliefs.
And Chastain admits things were especially hard for her as one of the only females in the group - because she had to use her feminine wiles to gain access to a correctional facility.
She tells New York Magazine, ""One day, we drove up to the gate and they wouldn't let us through. I said, 'What's happening?' And the driver said, 'You have to get out of the car. The guards want to see you walk.'
""I was so angry. I thought, 'Well, I could just turn around and go back to the hotel and then the movie doesn't get made, or I can get out of the car and walk past these guys who haven't seen a woman in a long time.' I didn't necessarily feel completely safe.""