From the publisher:
COMPLETELY UNFATHOMABLE combines the whole of Jason Sholtis’ (The Dungeon Dozen) 2018 Ennie Award-winning adventure Operation Unfathomable with its new companion volume Odious Uplands, adapted and expanded for the DCC game by Paul Wolfe (Mystic Bull Games, DAMN Magazine). All of the material from the OU Players Guide is included as well.
In Operation Unfathomable, fledgling adventurers descend into the Unfathomable Underworld, a subterranean environment of unsurpassed strangeness and peril, seemingly beyond all hope of survival, on an apparently simple mission to discover what became of a powerful group of politically important adventurers bearing a missing artifact.
Should any of their number manage to survive, the Odious Uplands await! The brave companions emerge into the untamed wilds of Stonespear Province, a land bathed in the dim radiance and ineffable influence of the Chaos Aurora and inhabited by all manner of megafauna, vicious saber-toothed apes, Woolly Neanderthal rangers, scarcely describable entities staggering forth from the Underworld, and other adventurers seeking their fortunes.