美国核潜艇蒙坦娜号在深海追踪一个不明物体的时候不幸失踪，高压潜水钻台深海之心号工头巴德（艾德·哈里斯 Ed Harris 饰）接到命令负责配合科菲上尉（迈克尔·比恩 Michael Biehn 饰）前去营救。令人意想不想不到的是一同前往的还有跟巴德一直在闹别扭的妻子—— 石油公司工程师琳西（玛丽·伊丽莎白·马斯特兰托尼奥 Mary Elizabeth Mastrantonio）。三人为主的救援队潜到潜艇失踪的海底深渊边缘，却发现潜艇上无人幸存，令人恐慌的是深渊里还存在着一种未知的怪物。经过一系列的危机之后，科菲上尉不听劝阻认定这是苏联的阴谋，决定把从潜艇上拆下来的核弹发射给不明的敌人，于是巴德和琳西联手开始了殊死搏斗。千钧一发之际巴德不顾危险救下了琳西，并且潜下深渊去拆掉核弹头上的引信，完成任务之后巴德的氧气已经消耗殆尽，而就在此刻深海的怪物再次出现收起
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