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S.O.S. Titanic is a 1979 television movie that depicts the doomed 1912 voyage from the perspective of three distinct groups of passengers in First, Second, and Third Class. The script was written by James Costigan and directed by William Hale (credited as Billy Hale). It is the first Titanic film released in color.
First Class passengers include a May–December couple, John Jacob Astor IV (David Janssen) and his new wife Madeleine Talmage Force (Beverly Ross); their friend, the notorious "unsinkable" Molly Brown (Cloris Leachman); another pair of honeymooners, Daniel and Mary Marvin (Jerry Houser and Deborah Fallender); and Benjamin Guggenheim (John Moffatt), returning to his wife and children after a scandalous affair.
One plot line relates the tentative shipboard romance of two schoolteachers, Titanic survivor Lawrence Beesley (David Warner, later appearing in the 1997 film Titanic) and the fictional Leigh Goodwin (Susan Saint James). Both are saved.
In steerage, the plot focuses on the experiences of eight Irish immigrants, who are first depicted approaching the ship from a tender in the harbor of Queenstown (now Cobh), Ireland. These characters, all based on real people, include Katie Gilnagh (played by Shevaun Bryers), Kate Mullens, Mary Agatha Glynn, Bridget Bradley, Daniel Buckley, Jim Farrell, Martin Gallagher, and David Chartens. During the voyage, Martin Gallagher falls for an unnamed "Irish beauty."
The cast also includes Helen Mirren in a small role (Irish chambermaid) early in her career.

Source: Wikipedia