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Documentary exploring the lives of the ocean's largest mammals and the secrets of their survival. Cameramen Doug Allan and Didier Noirot travel from the Indian Ocean to the Arctic seas, filming 200-ton blue whales and fighting humpbacks. The team also discovers that southern right whales possess a pair of one-ton testicles and reveals how Arctic bowheads can live to be more than 200 years old. Narrated by Stephen Fry.