Together with his loyal servant Conseil and harpooner Ned Land, Aronnax boards the USS Abraham Lincoln, a United States warship, to search for the elusive creature. However, their encounter with the supposed monster takes an unexpected turn when they discover that it is, in fact, a technologically advanced submarine called the Nautilus, captained by the enigmatic Captain Nemo.The majority of the novel takes place underwater as Aronnax, Conseil, and Ned Land become captives aboard the Nautilus and embark on a remarkable voyage across the world's oceans. Verne's meticulous descriptions bring to life the wonders of the deep sea, including encounters with various marine creatures and exploration of underwater landscapes.As the characters spend time on the Nautilus, they uncover Captain Nemo's motivations, his disdain for civilization, and his personal quest for vengeance against the world above. The novel delves into themes of scientific exploration, the conflict between man and nature, and the consequences of unchecked technological advancement."20,000 Leagues Under the Seas" is notable for its visionary depiction of advanced submarine technology and the underwater world, which was ahead of its time. Verne's vivid imagination and attention to scientific detail make the story both thrilling and thought-provoking.