An underground cathedral carved from raw stone, massive pillars twisted like organic growth reaching toward a vaulted ceiling pierced by shafts of golden light, ancient machinery humming in alcoves, steam rising from pools of mineral water

A subterranean brutalist cathedral built into a salt mine, massive concrete pillars descending into crystalline white caverns. Industrial flood lights casting hard shadows across geometric altars carved from rock salt. Abandoned mining equipment scattered like fallen monuments. The air thick with mineral dust, every surface reflecting fractured light. Cathedral organs built from repurposed ventilation shafts, silent but waiting. No bioluminescence, no floating anything - just weight, depth, and the hum of pressure from miles of earth above.