"In Caverns Below" by Stanton A. Coblentz is a satiric science fiction novel originally published as a magazine serial in 1935. When two explorers become trapped in a Nevada mine, they stumble upon a vast underground civilization beneath North America. The pale-skinned inhabitants possess advanced technology but remain locked in perpetual war. As the explorers navigate this hidden world, they find themselves entangled in political intrigue, cultural misunderstandings, and desperate attempts at reform that lead to unexpected consequences. (This is an automatically generated summary.)