Following the success of "The Godfather", "The Conversation", and "The Godfather Part II", Coppola began filming "Apocalypse Now", an adaptation of Joseph Conrad's "Heart of Darkness" set in Cambodia during the Vietnam War. Coppola himself briefly appears as a TV news director. The production of the film was plagued by numerous problems, including typhoons, nervous breakdowns, the firing of Harvey Keitel, Martin Sheen's heart attack, and extras from the Philippine military and half of the supplied helicopters leaving in the middle of scenes to fight rebels. It was delayed so often it was nicknamed "Apocalypse When?" The 1991 documentary film "", directed by Eleanor Coppola (Francis's wife), Fax Bahr, and George Hickenlooper, chronicles the difficulties the crew went through making "Apocalypse Now" and features behind-the-scenes footage filmed by Eleanor. After filming "Apocalypse Now", Coppola famously stated, "We were in the jungle, there were too many of us, we had access to too much money, too much equipment and little by little, we went insane."