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She said: “When I got the job, I thought it would be good for me because it would make me more courageous.
“The director told me he had worked with actors who had not wanted to do the amount of stunts I felt comfortable doing. So I was quite pleased with myself.”
"My character is an escapologist, so I had to do stuff like escape from a tank filled with piranhas while chained up.
Being chained underwater sounds scary but Isla insists she wasn’t frightened.
She said: “I was not scared because you run through the stunt so many times and practise and build up your lung capacity and know where the quick release is on the handcuffs.”
She already suffered a near-death experience while filming a stunt in a water tank.
"It's actually been exaggerated... I was in the tank and my handcuffs got caught underneath the bottom slats and I was basically drowning," she admitted. "It was the first time I'd been handcuffed underwater, the first time I had a near-death but I was in the tank for three days and I got very relaxed towards the end."