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.

When it is revealed that Nemo has been too daring and put the crew in danger, they lock him in his cabin and Boniface takes command instead. At the magnetic north pole, the problems pile up. Nemo must unite his divided crew by telling them who he really is.

The Nautilus crew spread rumours that the East India Mercantile Company is failing. When the stock price plunges, a shareholder meeting is called for tonight. Nemo and the crew have three hours to scheme their way into that meeting, so they can dissolve the Company forever.