* Features advanced technology: The Nautilus, the submarine in the story, is a marvel of engineering with features like electric lighting, air conditioning, and a powerful engine, which were all considered futuristic in Jules Verne's time.
* Explores the unknown: The novel takes the reader on an underwater journey to a world that was largely unexplored in the 19th century. Verne uses his imagination to create fantastical underwater creatures and environments.
* Embraces scientific principles: While imaginative, Verne incorporated scientific concepts and theories of the time into the story, lending it an element of scientific plausibility.
* Addresses themes of societal concerns: The novel also explores themes of scientific advancement, humanity's relationship with the natural world, and the potential dangers of technology, which are common themes in science fiction.
In short, "Twenty Thousand Leagues Under the Sea" combines futuristic technology, fantastical exploration, and scientific elements to create a captivating story that embodies the spirit of science fiction.