Ahead of the film’sFeb.

“Projecting it out, he could’ve made it pretty long.

Like, hours.”

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

“He’s stabilized,” Cameron observes.

Jack might’ve lived, but there’s a lot of variables.

“So, you heard it here for the first time.

James Cameron and Leonardo Dicaprio on the set of ‘Titanic’

James Cameron and Leonardo Dicaprio on the set of ‘Titanic’.Merie W. Wallace/20th Century Fox

Yes, he could have fit on that door, but it would not have stayed afloat.

It wouldn’t.”

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

Watch Cameron test the floating door theory in the clip above.