Diggers, including PLA soldiers and armed police, use excavators and bulldozers to dig a diversion channel for a quake lake at Tangjiashan, Beichuan County, which was formed by landslides after the May 12 earthquake and now blocks the river Jianhe on May 26, 2008. Helicopters have airlifted professionals and materials for the operation to the area Monday afternoon. [Xinhua]