How we made Frozen Planet

David Attenborough: 'Polar bears actually like to eat humans. We had to learn how to shoot rifles'

David Attenborough, presenter

Even though I was 84, being at the poles wasn't too hard. It's not as if I ever had to walk far or pull a sledge. If you wear the right clothes, you can tolerate low temperatures - though if something goes wrong and you lose a glove, you might equally lose a hand.