Photo taken on Nov. 6, 2020 shows the interior of an MY-12 multifunctional yacht with an underwater sightseeing capsule at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 6, 2020 shows an MY-12 multifunctional yacht with an underwater sightseeing capsule at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 6, 2020 shows an MY-12 multifunctional yacht with an underwater sightseeing capsule at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 6, 2020 shows the interior of an MY-12 multifunctional yacht with an underwater sightseeing capsule at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 6, 2020 shows the interior of an MY-12 multifunctional yacht with an underwater sightseeing capsule at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 6, 2020 shows the interior of an MY-12 multifunctional yacht with an underwater sightseeing capsule at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 5, 2020 shows a SM300-3 submersible at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 6, 2020 shows the interior of a SM300-3 submersible at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)

Photo taken on Nov. 6, 2020 shows a SM300-3 submersible at the Intelligent Industry & Information Technology exhibition area during the third China International Import Expo (CIIE) in Shanghai, east China. (Xinhua/Li Renzi)