People view maritime relics at an exhibition in China Maritime Museum in Shanghai, east China, Dec. 28, 2020. The Exhibition of Chinese Ancient Maritime Relics opened in Shanghai's China Maritime Museum on Monday, displaying over 160 ancient maritime relics from 25 domestic museums. (Xinhua/Fang Zhe)

Photo taken on Dec. 28, 2020 shows a maritime relic at an exhibition in China Maritime Museum in Shanghai, east China. The Exhibition of Chinese Ancient Maritime Relics opened in Shanghai's China Maritime Museum on Monday, displaying over 160 ancient maritime relics from 25 domestic museums. (Xinhua/Fang Zhe)

People view maritime relics at an exhibition in China Maritime Museum in Shanghai, east China, Dec. 28, 2020. The Exhibition of Chinese Ancient Maritime Relics opened in Shanghai's China Maritime Museum on Monday, displaying over 160 ancient maritime relics from 25 domestic museums. (Xinhua/Fang Zhe)

People view maritime relics at an exhibition in China Maritime Museum in Shanghai, east China, Dec. 28, 2020. The Exhibition of Chinese Ancient Maritime Relics opened in Shanghai's China Maritime Museum on Monday, displaying over 160 ancient maritime relics from 25 domestic museums. (Xinhua/Fang Zhe)

People view maritime relics at an exhibition in China Maritime Museum in Shanghai, east China, Dec. 28, 2020. The Exhibition of Chinese Ancient Maritime Relics opened in Shanghai's China Maritime Museum on Monday, displaying over 160 ancient maritime relics from 25 domestic museums. (Xinhua/Fang Zhe)

People view a maritime relic recovered from Nanhai No. 1, a shipwreck dating back to the Song Dynasty (960 A.D.-1279 A.D.), at an exhibition in China Maritime Museum in Shanghai, east China, Dec. 28, 2020. The Exhibition of Chinese Ancient Maritime Relics opened in Shanghai's China Maritime Museum on Monday, displaying over 160 ancient maritime relics from 25 domestic museums. (Xinhua/Fang Zhe)