Zero.

Summary

The story follows Old Yan Tou and his grandson as they navigate a perilous journey through a desert. After encountering a deadly dust storm, they find themselves trapped in a cave beneath flowing sand. Despite the dire situation, they discover an underground river, but soon realize the water is tainted by a parasitic beast. As they flee from danger, they encounter a mysterious object that may be a prehistoric relic. Ultimately, they manage to escape the cave, holding onto the relic, and step back into the sunlight, signaling a new chapter in their adventure.

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