Professionals and materials are airdropped for operations to blow a barrier lake at Tangjiashan, Beichuan County, which was formed by landslides after the May 12 earthquake and now blocks the river Jianhe.

Photo taken on May 22, 2008 shows an airscape of the quake lakes formed after the massive May 12 earthquake in Beichuan County, southwest China's Sichuan Province. According to a preliminary analysis, a total of 34 quake lakes have been found in Sichuan, eight of which contain more than 300 million cubic meters of water each.