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Visits to the most remote, cold and inhospitable places on the planet to reveal great mysteries that have been frozen in time. This episode considers Ecuador's mountain mystery.
Archaeologists in Russia find several mass graves, a Second World War plane sits on a Canadian mountain and cosmic rays in Antarctica have experts stumped.
A team attempts to locate a British Second World War aeroplane that went missing in Iceland. Plus, in Russia, 34,000-year-old graves are discovered.