An open mining pit in Tucson was used in the movie. It was one of the largest film sets ever dressed, at least two miles wide, and 1200 feet deep to create Bethlehem's camp. Engineers looked over the drawings for buildings of the future to see if they were structurally sound. They built Bridge City on the face of the dam that supplies half of Seattle's power. Despite the danger from being swept away they persisted with the work while wearing rubber suits.

Film

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