KINGDOM OF THE BLUE WHALE: Blue whales are the largest animals to ever live on Earth, yet they are difficult to find or track. Even some of the locations where they birth their young are great secrets. Join some of the world's eminent blue whale scientists as they embark on a revolutionary mission to identify and tag California blue whales as they migrate. This incredible voyage yields unforgettable new footage and insight into these amazing creatures' lives. HUMPBACKS: GIANTS OF THE OCEAN: Humpback whales are icons of their kind. However, centuries of slaughter have pushed them to the brink of extinction. Today their lives hang in the balance. Two teams of researchers are racing to learn what these whales need to survive. They'll get up close and personal with these giants, who at times are not so gentle, to reveal their secret lives.