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Create a 15-second underwater descent through a flooded stone cathedral. One adult diver, full mask, no blood, no jump scare bite. Beat one (0–4s): wide view of half-submerged arches; bioluminescent algae pulse along the walls; black water, slow particles; a wrist flare flickers on scarred but plain tactical gear. Beat two (4–9s): current pulls the diver down a stair of stone; the camera follows; bubbles and grit spiral; beneath the floor grates a vast eyeless shape slides, displacing water, never fully revealed. Beat three (9–15s): an arch cracks and a surge shoves the diver sideways; they catch an iron railing, flare sputtering; the shape passes under and the pulse of algae slows; hold on the diver breathing, alive, as silt settles. Vertigo from depth and scale, not from injury. No readable inscriptions, no religious violence. User request: A masked adult diver with a wrist flare drops through a flooded stone cathedral while a huge eyeless shape glides beneath the grates.