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Five college students explore a cave in search of a prize offered by a website. When they find an Aztec chest filled with blood, they absent-mindedly knock it over. The blood spills out, and at the same time, the sun disappears. The Earth will die unless something is done. According to some Aztec symbols, the only way to reverse the curse is to refill the chest with the blood of a dead person. From there, they have the difficult task of deciding which of them will be sacrificed to save humanity.