A "silent zone" suddenly appears at the bottom of the Pacific Ocean - all sonar signals disappear here. After the submarine passes by, the crew will tell the same hallucination: In a beam of light, someone said to them, "Come and be a shepherd."
Lu Tinglan was ordered to dive with the submersible, but found that he had lost his memory for three minutes. By the time she returned to the sea, three years had passed. What's even weirder is that "echo copies" begin to appear in the ocean - every missing ship sails back to the port, but the people on the ship don't know any relatives and will only repeat the same sentence:
"Lu Tinglan, you promised us."
