In the penal colony of Kalpani, captive Nemo and engineer Gustave Benoit secretly design a submarine, the Nautilus, with plans to escape. When Director Crawley arrives to seize the unfinished vessel for war, Nemo escapes with his crew. They’re soon joined by Humility Lucas, a bright young engineer, and her maid Loti. On their epic voyage, Nemo battles enemies, explores a magnificent underwater world, and embraces his role as captain in an unforgettable adventure, determined to enact revenge against the ruthless East India Mercantile Company.