In the summer of 2019, a lobsterman named Ezra Phelps caught something in his traps off Driftwood Channel, just north of Owl's Head, Maine. It wasn't a lobster. It wasn't a fish. It was a buoy — old, crusted with barnacles, painted a faded orange that might have been red once. He hauled it aboard because the line felt heavy, and when he pulled it up, the chain at the end was wrapped around something he couldn't explain. He told me about it three days later, sitting on the dock at dawn, his hands still shaking. He said he hadn't been back out since. He said he could still hear it — a low hum, like a wire under tension, coming from the bottom of the bay. This is what he told me, and what I saw when I went to look.