Your Letter from the Sea is a children’s literature work with the theme of marine scientific research that presents the brilliant achievements made by China in its marine technology. From the shallow sea to the deep sea under ten thousand meters, from the near sea to the far sea and to the polar regions, China has secured remarkable achievements in marine scientific research after more than 60 years of continuous development. The book begins with a letter from the scientific expedition team member of China’s first marine research vessel “Dongfanghong” to his daughter, and ends with a letter from the retired captain of the icebreaker “Xuelong” to his old partner. With all these warmhearted letters, all these abundant true scientific research stories, the book vividly reveals with full details the development of marine scientific research vessels and the portrait of several generations of Chinese marine scientists.