When it sank in the deep Atlantic during World War II, the Japanese submarine I-52 went to the bottom with over 100 lives and cargo that included two tons of gold. Now, a military veteran-turned-adventurer bucks the odds on a long-shot mission to solve a tantalizing mystery more than 50 years old, as he embarks on a deep-see search for a lost submarine and it's cargo of gold. Plunge three miles to the ocean floor, and explore the subs twisted remains in an effort to locate the shipment of gold. Be privy to declassified intelligence reports that reveal how WWII code breakers helped track down sub I-52. Be there as US Navy veterans retell stories of their mission to hunt down and sink this Japanese warship.