Summary

Portrait of Jules Verne Jules Verne 20,000 Leagues Under the Seas… (1870)

I said.
"In the very heart of an extinct volcano," the captain answered me, "a volcano whose interior was invaded by the sea after some convulsion in the earth. While you were sleeping, professor, the Nautilus entered this lagoon through a natural channel that opens ten meters below the surface of the ocean. This is our home port, secure, convenient, secret, and sheltered against winds from any direction! Along the coasts of your continents or islands, show me any offshore mooring that can equal this safe refuge for withstanding the fury of hurricanes."
Source: Wikisource

Portrait of Jules Verne Jules Verne 20,000 Leagues Under the Seas… (1870)

But while observing these different specimens of marine fauna, I didn't stop examining the long plains of Atlantis. Sometimes an unpredictable irregularity in the seafloor would force the Nautilus to slow down, and then it would glide into the narrow channels between the hills with a cetacean's dexterity. If the labyrinth became hopelessly tangled, the submersible would rise above it like an airship, and after clearing the obstacle, it would resume its speedy course just a few meters above the ocean floor.
Source: Wikisource

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