Finding Nemo have renounced fish-eating diet. While at their progress meeting, Marlin discovers the diver's mask and notices an address written on it. However, Dory and Marlin fight over the mask, accidentally giving Dory a bloody nose. The blood sends Bruce into a relapsed feeding frenzy, and he attacks Marlin and Dory, who narrowly escape. Nemo is placed in a fish tank in a dentist's office, where he meets the "Tank Gang", a group of pet fish led by Gill. The gang learn Nemo is to be given to the dentist's niece Darla, who has killed previous fish given to her. Gill
Captain Nemo: The Fantastic History of a Dark Genius joins him, but Verne, fearing what might happen, refuses. Nemo volunteers to fight in the Crimean War. While there, he is taken captive by one of his supposed allies, an Ottoman commander named Robur. Robur is engaged in a power-struggle with a rival official, Barbicane. Nemo is forced to design a submarine for use in the Ottoman navy; after many difficulties, it is finally launched, and christened the "Nautilus". Nemo and his fellow slaves use it to kill Robur, but not before their families — including the Turkish wife Nemo had taken and their son — have been killed. Grief-stricken,