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Video duration: 52:53Video has closed captioning.
A modern-day swordsmith reverse engineers the ultimate weapon of the Middle Ages — a sword both prized and feared.
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Secrets of the Viking Sword
Premiere Date: Oct. 10, 2012, 9 p.m.
Examine the thousand-year-old art and science behind the making of a Japanese warrior's signature weapon.
Step by painstaking step, see what it takes to create this iconic Japanese weapon.
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