What draws humans to the coldest and most hostile reaches of our planet?
The story of the few extreme survivors who remain in the polar regions during winter.
Autumn brings epic journeys for polar wildlife as most hurry to escape the refreeze.
The summer melt of Arctic ice provides opportunities for millions of animals.
Human Planet tells remarkable stories of people who make their homes in the Arctic.
Four severely-injured Afghan veterans attempt an unsupported trek to the North Pole.
Looking at the Arctic and Antarctic, the greatest and least-known wildernesses of all.
A look at marine invertebrates, including Humboldt squid, starfish and giant octopuses.