Director Juan Antonio Bayona and screenwriter Sergio G. Sanchez would never have made "The Impossible" if it wasn't for their producer's chance discovery of a radio program featuring Maria Belon, a Spanish wife and mother who along with her family survived the 2004 Indian Ocean tsunami.
That initial discovery led to a long-term relationship with Belon, her husband and their three sons.
The collaboration extended from Sanchez's script onto the set of the film. She spent hours with Bayona and Sanchez as they were writing the screenplay. She wrote long, lyrical letters to Naomi Watts, who portrays her in the film. Even composer Fernando Velazquez received a surprise visit from Belon when he was composing the score for the film.