Computer-generated imagery (CGI) was still prohibitively expensive at the time, and could be used only sparingly. Scenes had to be shot on the open sea as much as possible to prevent land from appearing in the background, and most of the stunts were done practically. Special effects scenes (such as the scenes with the diving bell and the air balloon) were mainly done by photo-optically combining separate shots together (which shows in certain scenes). CGI was mainly used by Digital Domain to create the water in the scenes with the Smokers' ship, and for touch-up in other scenes. The large water monster caught by the Mariner (nicknamed the 'whalefin') nearly didn't make the finished movie, but the producers successfully negotiated with the studio for budget to digitally animate the creature.

Film

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