The glow is nature’s way of signaling, luring, and protecting. In the deep, where light fades, bioluminescence lets creatures communicate—warning others, attracting mates, or luring prey. It’s also a defense trick: some species flash bright light to startle predators or release a flash of chemicals to escape. So the mysterious light is both a code and a survival tool, a reminder that even in darkness, the ocean keeps a language of its own.