Nemo and his fellow inmates at Kalpani Penal Colony are the slave labourers building an ironclad submarine - the Nautilus. Once finished, Nemo and a trusted crew plan to escape on it. But when Director Crawley arrives to demand the Nautilus be moved to Bombay to be armed - today - Nemo must leave. Now. With whoever he can muster as crew.

When the Nautilus is spotted by Company troopers, Nemo must inspire the crew to work together so they can reach the open seas before they’re run down. An encounter with whalers slows them down and just as they are about to reach the open sea and freedom, they are cut off by the formidable Dreadnought - and a game of depth-bomb cat and mouse ensues.

On Karajan the crew meet the eccentric White Rajah, but can they trust his hospitality? Nemo discovers a shocking truth, and Humility and the crew learn who Nemo really is.

Captain Nemo and his starving crew go ashore on a seemingly deserted island in search of food. When Blaster goes missing, Nemo and Humility embark on a daring rescue mission but soon encounter a giant electric eel.