What keeps a deep-sea cable working? What makes a tiny seal reliable in space? In Ningbo, East China's Zhejiang Province, seemingly ordinary products are solving extraordinary engineering challenges. Join People's Daily reporter Li Yuanxin as she visits two manufacturers to see how years of focus and innovation have turned niche products into critical components on global markets. (Produced by Li Yuanxin, Zhang Yu, Fang Ziyi and interns Liu Xinru and Zhou Huiru; Cover image designed by Li Mingzhi)