海上接连发现漂浮的骷髅，经检查，连骨髓都被吸食干净。一时间，人心惶惶。报社记者爱德华觉得事有蹊跷，并请来海洋专家威尔协助。意外发现，一只体形巨大的海底怪兽已占据海底隧道为巢穴，以人类做食物。威尔的两个潜水员也丧生在怪兽口中。而怪兽也受到食物人类的吸引朝城市靠近，一场人类的大灾难即将发生。而茫然不知的人们正在海边举行一年一度的海滩节，无数人群在海上嘻闹玩耍，殊不知海底怪兽已张开血盆大口，危机到来，看人类如何逃生？Several people disappear from and at the sea. Their bodies are found gnawed to the skeleton, even the marrow is missing. The scientists have no idea which animal could do such things. Dr. Turner begins to suspect that the company which builds a tunnel beneath the bay might have poisoned the environment and caused an octopus to mutate to giant dimensions. Just at the same time a great sailing regatta with many children is started - among them Turner's nephew Tommy.
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