The RMS Titanic set sail from Southampton, England, on April 10th 1912, and then struck an iceberg and sank four days into the trip, on April 14th 1912.
Brock Lovett is a treasure hunter looking for a famous diamond among the debris of the Titanic. He finds a sketch in a safebox in which a young woman is wearing the diamond on a necklace. After showing the drawing on a TV program, Rose Dawson, an old lady comes forward claiming to be the woman in the drawing. She is brought to the explorer's vessel to help them determine the location of the diamond, but instead she tells everyone the "real" story of Titanic's sinking. She was a 17 year-old rich girl sailing to the USA to get married with Cal Hockley. Her mother was forcing her to get married so she felt trapped inside her own world. During the trip she tries to commit suicide and she is saved by Jack Dawson, a third-class passenger who travels around making pencil drawings. They get to know each other better until they fall in love. Hockley and Rose's mother try to separate them several times. Amidst all this confusion the Titanic hits an iceberg and starts to sink.