SUBTERRANEA! Underground, Underworld, Tartarus and this Hollow Earth! Explore the worlds beneath our feet, from the eccentric Subway Wizards to the chained Titans of Tartarus to the Refuges of Dinosaurs and Cave People at the Earth's Core - and so very much more! Every kind of Subterranean adventure and creature is covered from the Earth's Core Mahars and Sagoth and the dinosaurs and Dinosaur Men to the Molemen of various types, Ratmen, Cave Giants, Cyclopaean Ruins and the monstrosities that might haunt them and vast ecologies of encounters. Randomize your way down into Subterranea, what you find when you get there, and how you might try and get back out - not always as simple as just climbing back in the mole machine or elevator, you see!