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Jim Al-Khalili meets British Antarctic Survey scientist Lloyd Peck and discovers giant sea spiders. They and other small animals grow far bigger than usual in the extreme cold. Diving is an important part of Lloyd's job and we hear what it's like to play football under the ice. Studies suggest that the sea temperature is rising, and Lloyd investigates whether the animals he researches will be able to adapt and survive.

Producer: Geraldine Fitzgerald.