Workers conduct work at a land subsidence accident spot in a community in Futian District of Shenzhen, south China's Guangdong Province, March 27, 2013. A security guard working at the community, who happened to walk past the subsidence area, fell and died. More than 400 families in the community were cut off from water supply due to the accident. (Xinhua/Tian Jianchuan)

Workers conduct work at a land subsidence accident spot in a community in Futian District of Shenzhen, south China's Guangdong Province, March 27, 2013. A security guard working at the community, who happened to walk past the subsidence area, fell and died. More than 400 families in the community were cut off from water supply due to the accident. (Xinhua/Tian Jianchuan)

Photo taken on March 27, 2013 shows a land subsidence accident spot in a community in Futian District of Shenzhen, south China's Guangdong Province. A security guard working at the community, who happened to walk past the subsidence area, fell and died. More than 400 families in the community were cut off from water supply due to the accident. (Xinhua/Tian Jianchuan)