James Cameron spent the 13 years between 'Avatar' movies on his other passion: deep-sea diving

Cameron learned how to scuba dive at age 17 and discovered the "keys to another world," he told The New York Times in 1989.

"Some people think of me as a Hollywood guy … (but) I make 'Avatar' to make money to do explorations," Cameron told The Daily Telegraph.

For what it's worth, Cameron earned a massive $350 million payday for "Avatar," Deadline reported in 2010, after factoring in his take from box office and home-entertainment sales.

"I sort of joke about this, but it's more true than not, that I made the movie because I wanted to do an expedition to the wreck of the 'Titanic,' and I did explore it," Cameron told NPR in 2012.

Cameron said that his love for filmmaking and exploration are intertwined.

"I think the through-line there is storytelling," he told NPR. "I think it's the explorer's job to go and be at the remote edge of human experience and then come back and tell that story. So I don't see them as that separately."

Cameron admitted in the special that some parts of his movie are "wrong" after visiting the wreckage.

"We found out you can have the stern sink vertically and you can have the stern fall back with and a big splash, but you can't have both," he said. "So, the film is wrong on one point or the other. I tend to think it's wrong on the fall back of the stern because of what we see at the bow of the wreck."

One of those, 2003's "Ghosts of the Abyss," documented Cameron's travels to the Titanic wreckage. In the other, 2005's "Aliens of the Deep," Cameron teamed up with NASA scientists to explore the sea creatures of mid-ocean ridges.

Cameron traveled to the deepest part of the Mariana Trench — seven miles down, called the Challenger Deep — in a specialized, state-of-the-art submersible, and spent over three hours there documenting the experience.

"It was very lunar, very desolate place, very isolated," Cameron said of the experience. "My feeling was one of complete isolation from all of humanity. I literally felt like in the space of one day I had gone to another planet and come back."

Cameron emailed The New York Times in 2019 to push back against Vescovo's claim that he went 52 feet deeper than Cameron.

Cameron argued that he found the area to be flat, disputing that anyone could go any deeper than he did.

The exhibit focuses on Cameron's 2012 Mariana Trench dive and the 12-ton, 24-foot-tall submersible he went down in.

"We need to become guardians for the ocean, warriors for the ocean — all of us in our society," Cameron said via Zoom during the exhibit's opening this week.

"A big part of our responsibility is as storytellers, not just to do the exploration, but when we come back, to tell the story of the science and what we discovered, what we saw with our own eyes," he said.

Cameron, along with billionaire Ray Dalio, the founder of investment firm Bridgewater Associates, bought a stake in the Florida-based Triton Submarines this week.

Cameron, Dalio, and the company's cofounder Patrick Lahey are now co-owners of Triton.

Dalio cofounded OceanX, a philanthropic ocean exploration initiative. Its main submersible is the OceanXplorer.

In 2021, National Geographic announced a docuseries called "OceanXplorers," executive produced by Cameron and Dalio, which would follow the exploits of the OceanXplorer vessel.

Cameron and the cast of the movie opened up to The New York Times in October about filming the underwater sequences.

When asked what the benefit is of the actors learning how to hold their breath for long periods of time, Cameron said, "Oh, I don't know, maybe that it looks good? Come on!"

Kate Winslet held her breath for seven minutes.

"I was very specific about what would be required, and we got the world's best breath-hold specialists to talk them through it," he said.