Thallium-Rich Karst Cavern Network

Jagged karst caverns yaw beneath the planet’s surface, their cold air tasted with metallic dust from thallium-rich bedrock. Dripping stalactites and narrow sinkholes carve a dim, echoing labyrinth where footsteps vanish and biosensor returns flatten into static. Hidden alcoves and mineral-lined chambers can hide fragile life, turning the subterranean maze into both refuge and moral crucible as urgent medical stakes collide with the danger of contamination and misread signals.