宁静的澳洲海滩上，宿醉的救生员乔许（泽维尔·塞缪尔 Xavier Samuel 饰）让女友蒂娜（沙妮·文森 Sharni Vinson 饰）的哥哥罗利替他去海上例行检查防鲨网的设置，结果罗利遭到了鲨鱼...
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