Narrated by Jodie Foster, this remarkable program explores the construction of the biggest dam on earth, designed to tame China's Yangtze River. For centuries, the rising water of the river has caused numerous tragedies, killing many and forcing multitudes of citizens to leave their ancestral homes and cities. With 40,000 people involved in its creation, the massive Three Gorges Dam will be 650 feet high and more than 2 miles across.