Competitors look at the monitors to see how their underwater robots are doing during the 11th International Underwater Robot Competition, held in Qingdao, East China's Shandong province. [Photo provided to chinadaily.com.cn]

The audience looks on as robots clear rubbish and clean the water during the 11th International Underwater Robot Competition, held in Qingdao, East China's Shandong province. [Photo provided to chinadaily.com.cn]

A competitor puts his robot into the water during the 11th International Underwater Robot Competition, held in Qingdao, East China's Shandong province. [Photo provided to chinadaily.com.cn]