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The Brent Geese reach Arctic Canada, where they encounter local people and culture. This far north, the GPS trackers fail, and the scientists prepare for a daring mission.
Continuing across Iceland, the Brent Geese fly over some amazing landscapes, but the glaciers beneath them are melting fast as a result of climate change.
With the Brent Geese trackers offline in the Arctic wilderness, scientists Stu and Kendrew attempt to locate them in one of the world's most remote places.