Armed policemen prepare to start to walk toward Tangjiashan quake lake in Beichuan county, southwest China's Sichuan Province, May 25, 2008. Armed police troop treked to the quake lake that poses a threat to the dam as airdrop can not be performed due to heavy fog.

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.