Two police officers search for a student's gaokao test permit in a river outside a senior high school in Pukou district of Nanjing, East China's Jiangsu province, on June 7, 2017. [Photo/Sina Weibo]

Police officers Mai Haijun and Chen Zhiyong came across some people gathering on a bridge outside a senior high school around 2 pm on Tuesday. They were told that a student's gaokao test permit had fallen into the river. The officers then jumped into the water to search for the permit. Their efforts helped ensure the student could enter the test venue smoothly that afternoon.

A police officer in the dirty water searches for a student's test permit in Pukou district of Nanjing, East China's Jiangsu province, on June 7, 2017. [Photo/Sina Weibo]