Leonardo DiCaprio got down on his knees for Kate Winslet in a pivotal “Titanic” scene.

Winslet, 48, discussed the Oscar-winning 1997 film at an advanced screening for her new movie “Lee” at the 92nd Street Y in New York City on Monday, Sept. 23. During a Q&A, Winslet spilled some tea about the movie’s infamous and much-debated door scene, according to People.

Winslet wagered a guess that co-star DiCaprio has “got PTSD” from being asked incessantly about the scene, in which – spoiler alert – he freezes to death because there’s not enough room for him on a floating door that Winslet’s character, Rose, has taken refuge on after the Titanic’s sinking.

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Leonardo DiCaprio and Kate Winslet in “Titanic” (1997).20th Century Fox/Paramount/Kobal/Shutterstock

“Well that was quite an awkward tank,” Winslet said of the giant water tank used to film the scene. “Because to burst the bubble, it was waist height at that time.”

“Leo, I’m afraid to say, was kneeling down. I shouldn’t be saying – anyways, Jimmy Cameron’s gonna be ringing me,” the actress quipped, referring to the movie’s director James Cameron.

Though the tank’s schematics proved less than ideal for DiCaprio, Winslet had one major benefit: she could easily pop off to the restroom.

“So first of all, I was regularly like, ‘Can I just go for a pee?’ And then I get up, get off the door, walk to the edge of the tank, sort of 20 feet away and I literally have to fling my leg over and climb up and come and get back on the door again,” she recalled. “It’s terrible.”

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Kate Winslet speaks onstage during a Special Screening of “Lee” Hosted by BAFTA at Pacific Design Center on September 19, 2024 in West Hollywood, California.Getty Images for BAFTA

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Leonardo DiCaprio and Kate Winslet in “Titanic” (1997).20th Century Fox/Paramount/Kobal/Shutterstock
She added, “Actually the thing that was amazing about the edges of the tank was it was an infinity tank. So there was constant water rushing and you could hear the constant sound of water.”

That sound meant that all the actors were “entirely looped” in “the last 22 minutes” of the film, according to Winslet, “because you can hear this water noise the whole time.”

Looping, or ADR, is a process done after a movie finishes filming in which actors can, among other things, re-record dialogue that wasn’t audible or usable when it was recorded on set.

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Director James Cameron works with Leonardo DiCaprio and Kate Winslet as they film the infamous ‘door scene’ in “Titanic.”Alamy Stock Photo

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According to Kate Winslet, the water tank that the ‘door scene’ in “Titanic” was filmed in was only waist-deep.20th Century Fox/Paramount/Kobal/Shutterstock
The Oscar winner also revealed that she snuck into screenings of “Titanic” when it came out after she missed the film’s London and Los Angeles premieres.

“When it premiered in London, I was really unwell. I had terrible food poisoning and I was actually in hospital in London, really weird. And then when it came out in the U.S. actually I was at the funeral of a boyfriend,” the “Mare of Easttown” star shared.

“I mean, it’s a horrible thing to even think about now. And obviously I wasn’t gonna miss that, so I sort of missed everything around the release of Titanic, which I don’t know, is that the universe’s way of protecting me or just reminding me to do the things that matter?”

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Kate Solomon, director Ellen Kuras, Kate Winslet, Alexandre Desplat, Noemie Merlant, Alexander Skarsgard and Andrea Riseborough attend the UK Premiere of “Lee” in London on Sept. 3, 2024.James Veysey/Shutterstock for Sky

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Kate Winslet plays famed American photographer Lee Miller in “Lee.” The movie opens in the US on Sept. 27.©Roadside Attractions/Courtesy Everett Collection
When she did see the film with audiences in a “packed theater,” slipping into showings unnoticed, she found it “quite strange.”

The actress has been happy to discuss “Titanic” over the course of her career, not shying away from talking about the blockbuster that rocketed her to superstardom.

And though she struggled with the overnight fame she achieved after the movie made a splash, today, she feels differently. “It’s not a burden, any of it,” Winslet told Porter in February.

“[Titanic] continues to bring people huge amounts of joy. The only time I am like, ‘Oh God, hide,’ is if we are on a boat somewhere.”

Winslet’s latest movie “Lee” hits theaters in the US on Sept. 27.