The Underwater Hunting Expedition in the Crespo Island Forest

Captain Nemo's invitation to hunt in his "forests" on Crespo Island initially strikes Professor Aronnax as a contradiction, given the captain's professed severance from all land. The mystery is resolved when Nemo reveals that the forests are not on land but underwater, a realm he has claimed as his own. The expedition thus becomes the first profound demonstration of the Nautilus's ability to grant its passengers access to a world previously beyond human reach, and it sets the stage for the wonders and perils that will define their voyage.

Equipment and Descent

To make the underwater walk possible, Captain Nemo equips his guests with the Rouquayrol-Denayrouze diving apparatus, a device he has refined for his own purposes. The system consists of a tank of compressed air strapped to the back, which supplies breathable air for nine to ten hours, and a copper sphere enclosing the head, necessary to withstand the pressures at depth. For illumination, they use the Ruhmkorff device, a sodium-activated Bunsen battery that powers a lantern emitting a continuous whitish light. Their weapons are equally advanced: streamlined rifles that fire small glass capsules charged with high-voltage electricity, capable of killing any animal instantly on contact. After dressing in seamless india-rubber suits reinforced with copper mail, the party—Captain Nemo, Professor Aronnax, Conseil, and a herculean crewman—enter a watertight cell that floods, allowing them to step directly onto the seafloor thirty feet beneath the surface.

The Underworld of the Plains and Forest

The party walks across fine-grained sand that reflects the sun's rays with startling intensity, and the light, decomposed by refraction, paints the edges of rocks, flowers, and polyps with all seven hues of the solar spectrum. They traverse a prairie of algae and enter the forest itself, where every plant, from the slenderest filament to the largest fucus, grows in a strict perpendicular line, governed by the density of the water. The forest is a realm of verticality, and the seafloor is strewn with sharp chunks of stone. Here, the line between flora and fauna blurs, as zoophytes are easily mistaken for water plants. The party rests beneath an arbor of winged kelp, and Aronnax falls into an uncontrollable doze, a common effect of prolonged diving. He is awakened by a monstrous, meter-high sea spider staring at him with beady eyes, which Captain Nemo's companion dispatches with a swing of the rifle butt.

The Hunt and the Return

As the party continues deeper, the darkness becomes profound, and they activate their Ruhmkorff lamps. The seafloor sinks into a narrow valley 150 meters down, ninety meters beyond the limit nature had previously set on man's underwater excursions. Captain Nemo takes aim with his electric rifle and shoots a magnificent sea otter, a rare and valuable mammal, and later his companion brings down an albatross with a single shot. The return journey is marked by a terrifying encounter: two enormous blue sharks, dreadful man-eaters, hurtle past the group, their phosphorescent glimmers betraying their presence. The party escapes only because the sharks have poor eyesight and fail to notice them. Guided by the Nautilus's electric beacon, they reach the ship, and after a difficult removal of their diving suits, Aronnax repairs to his stateroom, utterly exhausted but full of wonder at the startling excursion.

Narrative Role and Significance

The Crespo Island expedition serves as a crucial initiation for both the characters and the reader. It transforms the abstract concept of the Nautilus's underwater world into a tangible, sensory reality, showcasing the sublime beauty and the constant, lurking danger of the ocean depths. The event also deepens the mystery of Captain Nemo, revealing him as a master of technology who has not only built a submersible but has also claimed and explored the seafloor as his personal domain. For Aronnax, the experience cements his fascination with the voyage, while for Ned Land, who refused to participate, it underscores his growing alienation from a world he cannot escape.