What was the outline of 'Twenty Thousand Miles Under the Sea'?

Twenty Thousand Miles Under the Sea was considered one of Verne's masterpieces in France. The story was about a scientist named Aronnax who was sent to a submarine to study a new technology. In the process of diving deep into the sea, he encountered various dangers and challenges, and at the same time, he discovered the unknown secrets of the ocean. The story mainly involved science, exploration, politics, history, philosophy and many other fields. It showed the typical characteristics of Verne's science fiction, including the exploration of the unknown, the imagination of future technology, and the deep thinking of human nature. The protagonist of the story, Aronnax, constantly faced various challenges and dangers, but he also constantly discovered new knowledge and truths through his own efforts and courage. At the end of the story, some important scientific conclusions and historical facts were revealed. At the same time, it also showed the courage and wisdom of human beings in exploring the unknown and facing challenges.