Chronicle of the Hydrogen Sea

In the silent corner of the universe, an epic about the nature of existence is unfolding silently under the deep sea. 124 Light-years away, the dim light of red dwarf K2-18 shrouds a planet covered by a global ocean - K2-18b. Under the dark water pressure hundreds of kilometers deep, an intelligent civilization that does not rely on light, the "manifold race", has quietly evolved for hundreds of thousands of years. They use fluid vibrations to transmit thoughts, share memories with symbiotic microorganisms, and establish a unique deep-sea civilization in eternal tidal locking. In the year 2225 of the Earth Era, the human deep space probe "Yuanwang" arrived in this strange sea area. When human metal submersibles pierced the darkness of the twilight zone, two completely different civilizations met for the first time amid high pressure and silence. Human electromagnetic waves intertwined with the pressure waves of the manifold family to form a fragile bridge of understanding, and also accidentally triggered an ancient alarm buried deep in the planet's core. K2-18b is not a natural refuge. Millions of years ago, an ancient alliance sown the "seeds of civilization" here, setting this planet with a thick atmospheric barrier and a global ocean as a grand cosmic experimental site - testing whether intelligent life can develop in absolute low-key, whether it can resist the temptation of technological exposure, and whether it can maintain restraint in inevitable contact. The final assessment of the experiment has just begun at this moment. When humans try to interpret the deep sea with the thinking of earth civilization, when the manifold race must face the end of the closed world, and when testers from deep space use planetary ecology as the examination room to exert pressure - the two civilizations are forced to form a "silent alliance."