It's been almost 20 years since Titanicwas released, and even now the film still prompts a lot of discussion.

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The main recurring question, of course, being: Why the sweet hell didn't Rose just budge up a bit and make room for Jack on that very spacious plank of wood?

Via Giphy

Well, if we're ever going to get an answer to that question then now is surely the time: James Cameron announced on Tuesday that he's making a one-hour National Geographic documentary about Titanic, in which he'll explore the film's historical accuracy.

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"When I wrote the film, and when I set out to direct it, I wanted every detail to be as accurate as I could make it, and every harrowing moment of the ship's final hours accounted for," said Cameron.

"I was creating a living history; I had to get it right out of respect for the many who died and for their legacy. But did I really get it right? Now, with National Geographic and with the latest research, science and technology, I'm going to reassess."

Titanic: 20th Anniversary will air on National Geographic in December 2017.

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