A 24-hour journey around the South Seas. In the tropics, the reefs are a deadly city of predator and prey, and a nesting turtle is in a desperate race to the ocean. On the shores of South America, a starving fur seal baby awaits the return of its mother and, in Antarctica, humpback whales, seals and penguins are locked in a feeding frenzy to put on the blubber they need to get them through the harsh winter.