“Avatar: The Way of Water,” the long-awaited sequel to “Avatar,” looks full of underwater adventure.

“Avatar” stars Sam Worthington and Zoe Saldana are back for the film, set to open Dec. 16. with tickets already on sale.

The 2009 film remains the highest-grossing movie of all time, hitting more than $2.7 billion at the global box office.

Directed by James Cameron, Worthington and Saldaña return as Jake and Neytiri. They now live in Pandora with their family.

Cameron, who has been working on “The Way of the Water” since 2013, told GQ that in order for the film to be profitable

it will “have to be the third or fourth highest-grossing film in history. That’s your threshold. That’s your break even.” he said

The movie is the first of four “Avatar” sequels planned. An untitled third “Avatar” film is set for release Dec. 20, 2024.