Our planet is powered by the oceans, entangled in plants, and home to animals of every colour, shape and size. But in its last true wilderness, our planet is white - welcome to our frozen planet. Each year, a quarter of our planet is frozen solid, so let's journey to these ice kingdoms: Dive under the ice ceiling and learn to swim with the seal pups, take to the skies with frozen flamingos, and settle in for a snooze with a windy walrus.