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Most of the film has special effects, the clearest examples are the beginning, to make the first shots where you can see the complete ship, in these scenes were used models and replicas of the Titanic, also as cameras that repeated the scene several times without the viewer noticing, as well as smoke effects and also numerous shots of extras on green screens.
Also the scenes on the ocean, which was not really an ocean, were a combination of light, transparencies and movements, as well as scenes and photographs were used to make the final scene.

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When Leonardo DiCaprio embraced Kate Winslet in the mythical scene of Titanic in which they looked out to sea together, they were not in the Atlantic, nor in the port of Southampton, England. They were in the Mexican town of Rosarito, in a gigantic pool overlooking the Pacific Ocean. Specifically, they were in one of the four tanks that make up the Baja Film Studios, a facility created for James Cameron's film in 1996, but which, far from sinking with Jack and Rose, has become the most important in the world for filming shots in the water.

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To save money they used mirrors in numerous scenes. For example, there were only two boilers while four can be seen in the film. They also used stunt doubles and later on in the studios the faces were digitally replaced. As an example is the scene where Jack and Rose try to save a child and the water traps them in a hallway.

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Many of the sinking scenes were shot on a pond in California. In that same place they filmed the general shot where everyone is in the water with the life jacket floating. Or the moment when the ship is completely broken up (the ship was a giant model).

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The scenes following the sinking of the ship were filmed in a 350,000-gallon tank of water. To simulate the frozen corpses, the makeup and effects team applied powder on the actors that crystallized when exposed to water. Hair and clothing were waxed to create the wet look.

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James Cameron, director of the film, assured that the filming was not as difficult as people say, assuring that the tank was almost 27 degrees, very similar to a swimming pool. The icy breath was added digitally.