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$Team members of Ocean University of China control an underwater robot during the World Intelligence Underwater Robots Challenge held in north China\'s Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme \$

Team members of Ocean University of China control an underwater robot during the World Intelligence Underwater Robots Challenge held in north China's Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme "Dream pursuer in the water, intelligence winner in the future," is one of the five competitions being held during the third World Intelligence Congress. (Xinhua/Yue Yuewei)

$Contestants control an underwater robot during the World Intelligence Underwater Robots Challenge held in north China\'s Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme \$

Contestants control an underwater robot during the World Intelligence Underwater Robots Challenge held in north China's Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme "Dream pursuer in the water, intelligence winner in the future," is one of the five competitions being held during the third World Intelligence Congress. (Xinhua/Yue Yuewei)

$An underwater robot of National University of Defense Technology from China succeeds to trigger an information source during the World Intelligence Underwater Robots Challenge held in north China\'s Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme \$

An underwater robot of National University of Defense Technology from China succeeds to trigger an information source during the World Intelligence Underwater Robots Challenge held in north China's Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme "Dream pursuer in the water, intelligence winner in the future," is one of the five competitions being held during the third World Intelligence Congress. (Xinhua/Yue Yuewei)

$An underwater robot of a joint team of University of Melbourne and University of Sydney dives during the World Intelligence Underwater Robots Challenge held in north China\'s Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme \$

An underwater robot of a joint team of University of Melbourne and University of Sydney dives during the World Intelligence Underwater Robots Challenge held in north China's Tianjin, May 15, 2019. The World Intelligence Underwater Robots Challenge opened here on Wednesday, attracting 13 teams from China, the United States, Japan and Australia. The competition, with the theme "Dream pursuer in the water, intelligence winner in the future," is one of the five competitions being held during the third World Intelligence Congress. (Xinhua/Yue Yuewei)