Here are a bunch of pages on our website that are tagged hollow earth science fiction
Hollow Earth tales are just that, set within a putatively hollow (or at least honeycombed) planet Earth. The flagship of this subgenre is Jules Verne's novel Journey to the Center of the Earth. Michael Flynn's novella "Where the Winds Are All Asleep" is a modern homage. A popular variant is the aquatic-cavern-filled planet Naboo in the "Star Wars" franchise.