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Two gritty teams of hobbyist cavers attempt to break records for the longest and deepest caves in Canada.

Starting in the Far East on the frozen Japanese sea of Okhotsk, Joanna takes us across China and Mongolia, ending at Lake Baikal in Siberia, where she meets some amazing seals.

Historian Andrew Graham-Dixon shares recent discoveries of ancient Chinese art including a collection of alien-like bronze masks and a tomb of a warrior empress that holds the origins of calligraphy.