The sequel to the 2009 box-office smash “Avatar” — already deep in production — will feature many of the actors doing a lot of underwater work, according to the film’s director.

A good chunk of that underwater work involves freediving, which director James Cameron recently told Vanity Fair many of the crew — including star Kate Winslet — had been trained in:

“She [Winslet] blazed through for a couple of days of rehearsals and saw the world that we had created, and how we do the work, and she’s very excited. She plays a character who’s part of the Sea People, the reef people. The one thing she did do is demand that she does all her own water work. I said, ‘All right, that’s fine, we’ll have to teach you how to freedive.’ The other actors are up to three- and four-minute breath holds. We’ve already been doing underwater capture. We did a scene last week with six teenagers, well, actually five teenagers and one seven-year-old underwater holding their breath for a couple minutes and acting, actually doing a dialogue scene under water because they speak kind of a sign language.”

The question springs to mind on who might be training these actors?  One of them who came to mind was Performance Freediving International founder Kirk Krack, who has also trained stars like Tom Cruise for a “Mission: Impossible” movie.

We asked him, but all he could confirm was:

“I am working on Avatar 2 and I am training cast and crew.”

Beyond that, we’ll just have to wait with everyone else until the movie premieres on December 17th, 2020 to find out more.