The production's most frightening personal crisis came when Martin Sheen, who played Captain Benjamin Willard, suffered a breakdown and then a near-fatal heart attack while filming on location in the Philippines. Sheen was only in his thirties, yet the punishing conditions, prolonged schedule, physical demands, and psychological intensity of the role had taken a severe toll. His medical emergency threatened the entire picture, since Willard appears in nearly every major stage of the river journey. Rather than abandon the film, Coppola and the crew continued working around Sheen's recovery, and some material was completed with substitutes or by postponing scenes until he could return. The ordeal later became one of the central pieces of the 1991 documentary Hearts of Darkness: A Filmmaker's Apocalypse, which revealed how close the celebrated film came to collapsing along with its star.
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