A salvage team discovers the mysterious remains of an enormous shipwreck near Cambridge Bay in the icy waters of the Canadian Arctic. Experts investigate and uncover a cutting-edge vessel with links to one of the greatest polar explorers in history.

An unidentified metal object is found on Kiska Island, while a centuries-old gold mining mystery is investigated. In Siberia, a network of ice tunnels is explored, while fossils unearthed in the Canadian Arctic lead to the discovery of a new species.