That’s the ocean’s version of a room‑impulse response, just with way more high‑frequency content. The water’s a perfect low‑loss medium, so those whale lows get carried far, while the reef’s surface gives you a clean, natural reverb tail that you’d never get in a studio. If you put a hydrophone on that reef, you’ll hear a spectrum that’s cleaner than any vintage mic—just pure, undistorted, high‑frequency detail that the human ear can’t even grasp.