James Cameron is writing a “bible” based on the world of “Avatar” before he pens the sequel to the award winning film.

Lead man, Sam Worthington who played Jake Sully in the first hit movie has been confirmed for the sequel and has said that the award winning director is currently writing a book on which to base the script.

"At the moment, he's still writing what he calls 'The Bible' and detailing the world. Once he's detailed the world - more so than it's already detailed in his big brain, anyway - then, he said he can write the script, and we can go explore the world,” according to Worthington.

"Things like going underwater, going into the floating mountains."

Worthington is very excited about the plot for the sequel and said that Cameron has some “really cool” ideas.

He said: "We've been discussing that with Jim. He has had some ideas he told us, while we were filming, which were really cool and out there."

Talking about his characters on-screen relationship with Netiri played by Zoe Saldana, the Canadian actor said is was looking forward to seeing what happened to his character, who ended up living in a genetically-engineered alien body.

"I always joked and said that they were married and Jake Sully got lazy and Netiri kicked his butt. But there is something to the notion of being in a genetically-engineered body now, which he is. Is there a 'use-by' date on it? I don't know.

"What's the new dilemma? Is it just humans coming back, or is something even bigger than can threaten them, can threaten the world? We can look at our world again and see that we know we're hurting the environment, and we know we can do things about it. But what else are we doing that's wrong so it can reflect on our own life?" he added.

The brainchild of Cameron, "Avatar" grossed $2 billion worldwide and two follow up movies are planned, the sequel is due in December 2014.