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The narwhal, sometimes known as the unicorn of the sea, is one of the world's most elusive and poorly studied cetaceans, primarily because the animal spends all of its life underwater and lot of it under Arctic sea ice. Marine biologist Susanna Blackwell led a team which used sound recorders and satellite tags attached to several narwhals in Eastern Greenland, to follow their lives continuously for an unprecedented length of time. She talks Adam Rutherford through some of the amazing sounds that narwhals named Thora and Helge recorded.