The Pacific: The High Seas

A look at the region's most charismatic and remarkable animals, with leading marine biologists our guides to the challenges and delights of this watery world. The programme begins off Hawaii, where 10,000 humpback whales congregate after an epic 3,000-mile trip from the cold waters off Alaska in the north, with the warm waters a safe place to give birth, suckle their young and to mate