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[Suspense adventure, mainly plot, no CP, no emotional drama] A group of fifteen or sixteen-year-old high school students met for a trip, but encountered a car accident on the road. From then on, strange things followed them... The underwater tomb buried for thousands of years has no owner or burial objects. Instead, it has been occupied by various strange creatures. What unknown secrets does it contain? Where is the tomb owner? Who is driving all this behind the scenes?