"We took two stunt people who were the same body mass of Kate and Leo and we put sensors all over them and inside them and we put them in ice water and we tested to see whether they could have survived through a variety of methods and the answer was, there was no way they both could have survived. Only one could survive," he said.
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I saw this over the holiday period last month. James Cameron commissioned a study because he got sick of people yelling at him for killing Jack.
https://www.insider.com/james-cameron-had-forensic-analysis-...
This is peak underappreciated stuntpeople.