This episode begins in the tropics, where a white sperm whale calf stays close to its mother. The 19th century story of American whalemen stranded in their lifeboats after a sperm whale attack is used to illustrate the difficulty of surviving in the open ocean. The currents which circle the South Pacific support huge shoals and an incredible variety of life, but much of the center is an ocean desert. Nutrients are trapped at depth by the thermocline, making the windless surface clear but barren. Life can be tough for large predators. Some, including short-finned pilot whales, can dive to great depths to hunt squid. Others, like rare oceanic whitetip sharks, track the whales hoping for scraps or a chance to seize a young calf. Segment 1 (10:00 min)
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