This National Geographic special takes an intimate look at four types of   whales: pilots, humpbacks, bowheads, and orcas, through the eyes of the humans   who are closest to them. From the struggle to save a pod of pilot whales in      the Florida Keys to the groundbreaking work of a scientist risking life and    limb in the Arctic to the controversy over military sonar, this program takes  us to the front lines of whale conservation. 2006, 60 mins.