Who wrote 20,000 miles under the sea? What was the main content?

" 20,000 Miles Under the Sea " was a science fiction novel written by Verne in France in 1885. It mainly told the story of a diving ship," Nemo," designed by Verne, that encountered various dangers and challenges in the process of exploring the deep sea, as well as encounters with some mysterious creatures. The novel used Verne himself as the protagonist to tell the story of deep sea exploration through his experiences. In addition to the adventure story, the novel also involved science, philosophy, history and other aspects of knowledge. The novel was considered one of Verne's masterpieces and was hailed as a "milestone in modern scientific literature."