Zheng Renhao, Party secretary of Zhanjiang, delivers a keynote speech at the opening ceremony of the 2018 China Marine Economy Expo on Nov 22. [Photo/coeexpo.com]

Ma Xingrui, governor of Guangdong province, tours the National Pavilion of the 2018 China Marine Economy Expo. [Photo/coeexpo.com]

The major indexes of China's marine economy are released by He Guangshun, director of the National Marine Data and Information Service Center. [Photo/Zhanjiang Daily]

Jiaolong, the first manned submersible developed by China, is on display for the 2018 China Marine Economy Expo. [Photo/Zhanjiang Daily]

Visitors show keen interest in the unmanned submersible Hailong 11000. [Photo/Zhanjiang Daily]

The National Pavilion is stacked with visitors. [Photo/Zhanjiang Daily]

The delegation sent by Vietnam Shipbuilding Association poses for a group photo. [Photo/coeexpo.com]

Two foreign journalists cover the 2018 China Marine Economy Expo. [Photo/coeexpo.com]