In this chapter of Jules Verne's novel "Twenty Thousand Leagues Under the Seas," the protagonist, along with his companions, witnesses a shocking interaction between Captain Nemo and a warship. Captain Nemo reveals his intense hatred and desire for vengeance, unfurling a black flag and refusing to let the approaching ship see them as castaways. As the warship continues its cannonade, Captain Nemo remains defiant and declares his intent to sink it. Despite their attempts to escape and avoid being complicit in Captain Nemo's act of revenge, the Nautilus submerges and collides with the warship, causing it to sink with its crew onboard. The protagonist is left in shock, witnessing the destruction and loss of life carried out by Captain Nemo. The chapter portrays the depths of Captain Nemo's hatred and the tragic consequences of his actions. It also highlights the protagonist's sense of helplessness and the moral dilemmas they face in the face of such ruthless acts. The chapter evokes a sense of dread and moral turmoil as the characters grapple with the brutal and vengeful nature of Captain Nemo.