What does the wreck of the titanic have to do with the titanic movie?

Answer:
The movie "Titanic" (1997) is based on the actual shipwreck of the cruise ship RMS Titanic in April, 1912. The film includes much of the factual information on the disaster, and many of the characters were real people who were on the ship. But the central characters Rose (Bukater), Jack (Dawson) and Cal (Hockley) were not actual people.
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