Kate Winslet's role in Avatar 2 is still shrouded in mystery, but now we know that she had to wear wings underwater while filming. Anyone that's kept up with Avatar 2 knows that the movie is tackling water in a big way. Concept art shown for the movie puts a lot of focus on Pandora's water features, new underwater crabsuit vehicles were developed for the film, and Winslet's character, Ronal, is a part of the planet's "sea people." Now we know that Winslet had to wear a wing-like contraption while filming underwater after the official Avatar Twitter posted a picture of the actress on October 26. From Kate Winslet's recent interview in @THR: “I had to learn how to free-dive to play that role in Avatar, and that was just incredible.