Colin Firth, Rachel Weisz on the quiet violence and brutality of The Mercy, about a man going mad

Rachel Weisz, Colin Firth discuss this masterful, very British film about a man who becomes mad because of loneliness, the impossibility of going home, guilt and despair. Directed by James Marsh (The Theory Of Everything) the film is stunningly beautiful and yet stunningly brutal, the quiet violence without blood and gore being shocking.