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In the near future, sea levels will swallow up the continent and give rise to a deep-sea cyber civilization. When Lin Yumian, a Ph. D. In biology, traces the truth behind his father's disappearance, he discovers that the cyanobacteria experiments he left behind contain the keys to silicon-based civilization - these microorganisms that can independently construct topological structures have become quantumly entangled with the smuggling of nuclear waste in the undersea black market, the army of mechanical gills and the Mu continent that surfaced in Tokyo Bay. When his father's waterproof watch activated the dodecahedron core, the 2,000-meter trench opened up and led to the "Sixth Examination Room". In this forbidden deep sea area where mechanical jellyfish weave Dyson spheres and radioactive oyster shells record civilization maps, the immortal invigilator is using submarine volcanic eruptions to calculate entropy. The coral scar on the back of Lin Yumian's hand appears as the Pacific plate shifts, pointing to the activation coordinates of the lunar obelisk. In the survival game between the undersea city-states and the Mechanicus, the quantum algae generators and anti-matter engines that humans are proud of are just "admittance tickets" discarded by higher civilizations. When the cyanobacteria swarm begins to devour the underwater city, Lin Yumian must decipher the blood key code passed by his father using the Klein bottle model - this is not only the last key to prevent the annihilation of civilization, but also the ultimate containment experiment of advanced species on the earth.