Earth's Crust

Twenty miles beneath the surface, this dense crustal layer harbors Stahlman's volatile gas, the drilling project's ultimate target. Engineers target its depths with a nuclear-powered robot drill, risking pipe fractures from immense pressure and heat. Characters speak of penetrating it with mounting dread—Sutton warns of whips in the pipes, Gold hints at emergencies—turning the unseen barrier into a symbol of reckless ambition poised to unleash catastrophe. The crust looms as an impenetrable vault of power and peril.