When an eerie red glow appears, the giant eel suddenly releases the Nautilus, it turns out to be a chain of underwater volcanoes. Without steering power, the Nautilus continues to sink towards the dangerous lava - and it soon becomes clear that only Humility can save the crew.

A daring battle between the Company ships Dreadnought and Nautilus leaves both stranded in the Arctic ice, leading to an uneasy truce. Nemo reunites with a friend from his past and is shaken by more revelations about his father.