Forged in Fire (2015)

S8E13 San Mai Mystery

Four blacksmiths are taken by surprise when they're tasked with crafting san mai blades from a selection of mystery steel. To complicate matters, the clock will be unreliable, forcing the smiths to depend solely on their own judgment for timing. After an unexpected series of challenges, only a few will remain to choose between two weapons to create back at their own forges. Who will master the art of forging a weapon impressive enough to win the $10,000 prize and be named the Forged in Fire Champion?