The USS Monitor, a revolutionary ironclad warship, proved to be a crucial tool in keeping Confederate forces at bay during the Civil War. Unfortunately, the ship sank off North Carolina's Cape Hatteras a year after its launch. This "Nova" documentary follows an expedition launched in order to retrieve artifacts and learn the secrets behind one of American history's most famous vessels. 60 min. Standard; Soundtrack: English Dolby Digital stereo; Subtitles: English (SDH).