Tide Time

In 2045, China built the world's first gravitational wave observatory, "Taichu". While debugging the equipment, chief analyst Jiang Xinghe captured a set of unnatural signals from 4.6 Billion years ago. After deciphering, the message only contained one sentence: "You are not the first. We are coming back. Please leave before the tide comes." "Tides" are not ocean tides, but gravitational fluctuations that periodically destroy entire civilizations. The last time it came, the dinosaurs went extinct; the last time it came, the Permian died off. And its triggering conditions are precisely linked to the development level of intelligent civilization - when surface civilization finally has the ability to detect gravitational waves, the "tide" will come within a few years. Jiang Xinghe discovered that the "important weapon of a great power" that mankind is proud of is actually a beacon that summons the doomsday. And deep in the mantle beneath our feet, a previous civilization that had been hiding for 4.6 Billion years was watching the struggles of the new civilization with cold eyes. Flee, hide, disguise, or fight? The countdown has started. When the cleaners in the depths of the universe wake up, the only thing humans can rely on is not weapons, but wisdom; not escape, but stories. "We shouldn't have lit that light. But the light has been turned on, and we must face the darkness behind the light."