Lost in the Atlantic Valley; Or, Frank Reade, Jr., and His Wonder, the "Dart"

Frank Reade Jr. is the latest prodigy of a famed line of American inventors, and he has just completed his most daring creation: the Dart, a sleek, electrically powered submarine built for a voyage into the mysterious Atlantic Valley—a vast trench that runs beneath the sea. Accompanying him is the erudite German scientist Professor Von Bulow, whose curiosity about the deep‑sea landscape matches Frank’s confidence in the vessel’s safety. Together they have sparked a city‑wide buzz, with locals eager to see whether the daring expedition will succeed or end in disaster.

The Dart is described as a floating palace beneath the waves, its thin‑rolled steel hull fitted with airtight glass windows, luxurious cabins, and an electric searchlight that turns night‑deep into daylight. Hidden compartments house compressed‑air generators and automatic ballast tanks that let the craft rise or sink at a whim. As the launch draws near, the crew prepares to test the limits of human endurance, living on artificial air far below the surface, while the promise of unseen marine life and uncharted topography looms just beyond the hull’s view.