Main Fiction: “When Caverns Yawned” by Captain S. P. Meek, first published in Astounding Stories, May 1931.
Narrator: Josh Roseman.
“I could kill you as you stand there; you into nothingness; but I do not choose to do so—yet. Other attempts I have made you have frustrated, but this time I shall succeed. I will institute a reign of terror which will bring your rich, foolish country to its knees. Listen, while I give you a taste of my power. The city of Charleston is about to be destroyed.”