Ten days after the 8.0-magnitude earthquake in Sichuan province on 12 May 2008, Ai led a team to survey and film the post-quake conditions in various disaster zones. In response to the government's lack of transparency in revealing names of students who perished in the earthquake due to substandard school campus constructions, Ai recruited volunteers online and launched a "Citizens' Investigation" to compile names and information of the student victims. On 20 March 2009, he posted a blog titled "Citizens' Investigation" and wrote: "To remember the departed, to show concern for life, to take responsibility, and for the potential happiness of the survivors, we are initiating a "Citizens' Investigation." We will seek out the names of each departed child, and we will remember them."