Tides of Change

S1, E6: From the eastern end of the Great Wall, China's coast spans 14,000 kilometers and more than 7,000 years of history. As this thrilling natural history documentary reveals, this is a place of huge contrasts: futuristic modern cities, ancient tea terraces and wild wetlands where rare animals still live. White dolphins, red-crowned cranes, giant sturgeon and saber-wielding monkeys all try to survive.