The 26-year-old star said she specially learnt the dangerous skill for a underwater battle scene in the film, reported Entertainment Weekly.
"I worked with this amazing free-diver, and he came in and I did four sessions with him. It's all about lowering your metabolic rate. It's like you meditate underwater. That's what free-divers do, but it's amazing," Robbie said.
The actress said as her training went on she even started holding her breath for longer time, "I got to five minutes and I was like, 'You know what? This is above and beyond what I thought I'd get to. I'm good, I'm good with five.
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