(Act I: The Breach) The surgery had been a triumph of modern science. They called it "The Lazarus Protocol." My grandfather, Elias, had been dead for four hours when the electrodes sparked and his heart began to beat again. I was there when he opened his eyes in the sterile white light of the ICU. He looked at me, and for a moment, I saw the man who had taught me how to fish. But then he blinked, and the expression shifted into something vacant, something ancient. He didn't recognize the room, the doctors, or even me.

(Act II: The Undercurrent) We brought him home to our house by the lake, but the man who returned was not Elias. He would stand for hours in the hallway, staring at the wall with an intensity that made the air feel heavy. He stopped speaking in sentences, instead humming a low, rhythmic vibration that sounded like the movement of tectonic plates. I started noticing things—small, impossible things. The fish in the pond would jump out of the water just to touch his feet. The house felt colder whenever he entered a room, and I began to have dreams of a vast, sunless ocean where things with too many eyes waited in the silt.

(Act III: The Breaking Point) The tension peaked on a Tuesday evening. I found him in the basement, standing over a bowl of water, whispering to it. When he turned to look at me, his pupils had expanded to cover the entire iris, turning his eyes into two black holes. "The pressure is too low here," he whispered, his voice sounding like grinding stones. He reached out to touch my face, and I felt a sudden, crushing weight, as if I were being pulled down a thousand fathoms. I realized then that the Lazarus Protocol hadn't brought back my grandfather; it had simply opened a door, and something from the depths had walked through it using his skin as a suit.

(Act IV: The Echo) I didn't tell the doctors. I didn't call the police. I simply locked the basement door and pushed a heavy oak wardrobe against it. I can hear him now, scratching at the wood, humming that low, rhythmic song. Every night, the scratching gets louder, and the house feels a little more like it's sinking into the earth. I sit in the living room, staring at the lake, wondering if it's better to be alone in the world or to have a grandfather who is no longer human.

--- **Tensor Code (OTMES_v2):** [M7: 9.0, M4: 6.0, N2: 0.8, K1: 0.7, TI: 52.1, θ: 95°, E: 16.3]