As the expedition continued into the subterranean world, the party faced a grim reality: the absence of water. The narrative describes a harrowing journey through a "steep slope" and a "slow climbing downward," where the silence of the group was not merely a choice but a necessity to conserve energy. The physical toll on the narrator was immense; suffering from a "terrible headache" and dizziness, he eventually collapsed, crying out, "Help! I'm dying!" This moment of despair pushed Uncle Lidenbrock to a breaking point, where he declared, "It is over," suggesting that the expedition was doomed before it had truly begun. The internal tension is palpable, as the narrator realizes that even if they turned back, their "weakened state" made survival unlikely.
Hope was rekindled when Hans, the guide, detected the sound of flowing water. Though the narrator was initially skeptical and physically incapacitated, the simple word "vat"—meaning "water" in Icelandic—transformed his condition. He noted, "Suddenly I felt no pain. I had new strength." The group followed the sound for over 2,000 feet, identifying it as an "underground river."
Despite the proximity of the water, the group faced a geological barrier. Hans exhibited remarkable intuition, using a "pickaxe" to strike the "hard rock" wall. The narrator admits that in his desperation, he had "forgotten many things I had learned about geology," including the danger of disturbing underground rock formations. However, the risk paid off. As the rock wall gave way, a "river of water broke free." The water, initially "boiling," eventually cooled, allowing the team to hydrate and fill their flasks. In honor of their guide's ingenuity, they named the discovery "Hansa's Brook."
Rather than sealing the water source, Uncle Lidenbrock made the strategic decision to "follow its natural course." This choice proved pivotal, as the stream served as a guide through the increasingly challenging terrain. The journey remained arduous, with passages so narrow that they "had to crawl on our bellies." Nevertheless, the presence of the "small stream of water" provided the necessary sustenance to push forward. The chapter concludes on a note of transformative success, as the arduous path eventually led the group to a "new paradise," marking a significant turning point in their subterranean exploration.