The Sunken Isthmus; or, Frank Reade, Jr., in the Yucatan Channel.

The story opens with a spirited debate among members of the World’s Geographical Society. When archaeologist Wilbur Wade claims that the Yucatán Channel once held a solid land bridge, his colleagues scoff and demand proof. Undeterred, Wade announces an audacious plan: he will descend beneath the sea in a specially built submarine—an invention of the ingenious young engineer Frank Reade, Jr.—to locate the lost isthmus himself.

As the expedition launches, the underwater world reveals both wonder and peril. Daring divers clash with a fierce antagonist wielding an axe, while strange currents and hidden caverns test the crew’s resolve. Wade’s scientific curiosity is matched by Reade’s inventive brilliance, setting the stage for an immersion into mystery, danger, and the thrill of uncovering a forgotten chapter of Earth’s geography. Listeners will be drawn into a vivid early‑1900s adventure where ingenuity meets the unknown depths.