National Geographic Meltdown: Three urban treasure hunters battle the market and fierce competition as they seek out precious metals in unorthodox places and melt them down for cash. Russell visits an aerospace shop to scope out airplane parts. He puts big money into a massive engine that could contain precious metals -- a risky gamble that he hopes will pay off. Looking to score big on gold teeth, Ron and Melanie strike a deal with a dentist. Meanwhile, Joe visits a medical supply warehouse in search of silver.

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Documentary