Colin Firth brilliantly plays a man who goes mad because of his own decision, because of the impossibility to change it and go back, because of despair, loneliness and longing for his family. C. Firth took sailing lessons and starved himself to become gaunt, as the final scenes required. The two stars discuss how they created the very moving scenes, the hallucinations, how they collaborated on the set and what their feelings regarding this tragic character are. 'The Mercy', directed by James Marsh, was shot in UK (Devon) and Malta