James Cameron has promised the world four sequels to his 2009 box office record breaker Avatar, with work underway to bring each instalment to cinemas soon.

Last month, reports circulated saying filming will begin later this year, on the 15 August to be exact, something that has been backed up by Sigourney Weaver.

“We’re starting training, and we’re starting — hmm, I probably can’t say anything,” she told The Hollywood Reporter. “We will be actually shooting it by the fall.”

Cameron has previously said all four sequels will film back-to-back, the filmmaker having recently finished work on the scripts, announcing in February that production has already begun.

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“I’m telling you, these scripts are so amazing, I’m not worried about [disappointing fans] at all,” Sigourney added. “Am I worried about how we’re going to bring them to life? Yes, because they’re so ambitious. They’re so worth it. They're well worth waiting for. I’m not worried about that at all. We’re trying to get it done as quickly as possible.”

Due to the nature of the filming, the release date for Avatar 2 has been pushed back, Cameron saying: “Well, [Christmas 2018] is not happening.”

“What people have to understand is that this is a cadence of releases,” he continued. “So, we’re not making Avatar 2 - we’re making Avatar 2, 3, 4 and 5. It’s an epic undertaking. It’s not unlike building the Three Gorges dam.”

Considering it took Cameron four-and-a-half years to make Avatar, it’s no surprise the Titanic director needs a little more time for all four films.