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Documentary about an epic battle which changed the course of the American Civil War and transformed the face of naval warfare forever. It was the world's first combat between the ironclads, The Monitor and The Merrimack, but the technology which made these ships almost invincible also changed the nature of life on the seas. Shut out from daylight, depending on their machine for the air they breathe, the crew of the Monitor immediately feared their own vessel, naming her the iron coffin.