Transition of Juan Romero, The (The Work of H. P. Lovecraft, Episode 7)

The story involves a mine that uncovers a very deep chasm, too deep for any sounding lines to hit bottom. The night after the discovery of the abyss the narrator and one of the mine's workers, a Mexican called Juan Romero, venture together inside the mine, drawn against their will by a mysterious rhythmical throbbing in the ground. Romero reaches the abyss first and is swallowed by it. The narrator peers over the edge, sees something - "but God, I dare not tell you what I saw!" and loses co...