Videos on Demand: Mass Evacuation Underway in China

A total of 158,000 people (in about 30 towns) have now been evacuated from potentially vulnerable areas downstream from Tangjiashan lake. The lake's water level is rising by more than one metre pre day. It now holds as much water as 50,000 Olympic-sized swimming pools. If the water bursts through the natural barrier of rock and earth, more than one million people may have to be relocated.