After 25 years,James Cameronis offering a rare mea culpa, of sorts.

Ahead of his filmTitanic’sFeb.

The first test is a “baseline” meant to mirror what happens in the film.

Titanic: 25 Years Later With James Cameron

‘Titanic: 25 Years Later With James Cameron’.Spencer Stoner/National Geographic

“Final verdict: Jack might’ve lived, but there’s a lot of variables.

He couldn’t have anticipated what we know today about hypothermia.

He didn’t get to run a bunch of different experiments to see what worked the best.”

Titanic 25 Years Later With James Cameron James Cameron checks in on Josh Bird and Kristine Zipfel, who are exposed to frigid waters to test the impacts of hypothermi

James Cameron recreated ‘Titanic’ floating door scene to see if Jack fit with Rose.Spencer Stoner/National Geographic

The director further defends his ending by pointing out that it was a character choice.

ET on National Geographic, and streams the next day on Hulu.

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‘Titanic’.