Kuroshio

The Kuroshio, or Black Current, is the first great oceanic river through which the Nautilus travels after setting its course from the seas of Japan, a warm, indigo-hued current that carries the submarine northeastward and introduces Professor Aronnax and his companions to the marvels of underwater navigation. It is on this current that the Nautilus glides during the night of November 8, 1867, after Captain Nemo has fixed their starting position at longitude 137° 15' west of Paris and latitude 30° 7' north, about 300 miles from the Japanese shore. The Kuroshio, heated by perpendicular rays from the tropical sun, leaves the Bay of Bengal, crosses the Strait of Malacca, goes up the shores of Asia, and curves into the north Pacific as far as the Aleutian Islands, carrying along trunks of camphor trees and other local items, its pure indigo waters sharply contrasting with the ocean's waves. It is this current that the Nautilus is about to cross, and Aronnax watches it on the world map with his eyes, seeing it lose itself in the immenseness of the Pacific, feeling himself swept along with it as Ned Land and Conseil enter the lounge doorway, petrified at the sight of the wonders on display.

The Kuroshio as a Setting for Discovery

The Kuroshio provides the first sustained context for the Nautilus's underwater observation, as the ship travels at a depth of fifty meters and a speed of fifteen miles per hour, its electric beacon attracting a dazzling array of marine life. For two hours, a whole aquatic army escorts the Nautilus, and through the lounge windows, Aronnax, Conseil, and Ned Land witness fish cavorting and competing in beauty, radiance, and speed. Among them are green wrasse, bewhiskered mullet marked with pairs of black lines, white gobies with curved caudal fins and violet spots, wonderful Japanese mackerel with blue bodies and silver heads, glittering azure goldfish, several varieties of porgy or gilthead, trumpetfish with flutelike beaks, Japanese salamanders, and serpentine moray eels six feet long with sharp little eyes and huge mouths bristling with teeth. The current itself is described as a seagoing river, one of the five chief currents whose global paths science has defined, and its warm waters, pure indigo in color, stand out sharply against the ocean's waves. This initial passage through the Kuroshio establishes the pattern of wonder that will define the voyage, as the Nautilus glides through the swiftly flowing current while Aronnax spends the evening in reading, writing, and thinking before falling into a deep slumber on his eelgrass mattress.

The Kuroshio's Role in the Narrative

Beyond its function as a geographical setting, the Kuroshio serves as a symbolic and narrative threshold, marking the transition from the world of scientific speculation and public controversy about the "monster" to the direct, lived experience of the underwater realm. The current's name, meaning "Black Current" in Japanese, echoes the mystery and darkness that have surrounded the Nautilus, and its powerful, warm flow carries the ship and its passengers into a new element where the laws of the surface world no longer apply. The Kuroshio is also referenced later in the voyage as a point of comparison, when Captain Nemo discusses the Gulf Stream and other ocean currents, and when the Nautilus encounters the Sargasso Sea, which is formed by the circular motion of the Atlantic's currents. The current's presence in the narrative thus reinforces the novel's central theme of the sea as a living, dynamic system, a world with its own rivers, temperatures, and life, which the Nautilus navigates with the same ease as a ship on the surface.