Maxx is a legionnaire turned mercenary. When a mission in South America goes wrong Maxx is left for dead, but he is nursed back to health and reborn with a new outlook on life. He tries to live tranquilly within the confines of his new beliefs surrounded by his new friends at a church. But his peaceful days are short-lived when mercenaries he used to work with cross his path again and he is forced to revisit and face his own demons. His brutal past, war and violence have come looking for him again. His path to redemption is interrupted and Maxx becomes an avenging warrior using the skills that were his trade
1942年4月,二战期间,大西洋上,德军战舰采取“狼群”战术,令盟军损失惨重。美国海军上尉泰勒(马修•麦康纳 Matthew McConaughey 饰)因抗敌表现出色,曾被许诺晋升艇长,但是却因故不能如愿。这时突然传来敌情,泰勒临危受命,登上S-33老爷级潜艇执行秘密任务,指挥官为上尉迈克(比尔•帕克斯顿 Bill Paxton 饰),同行的还有哈什(哈威•凯特尔 Harvey Keitel 饰)上尉和库南少校等。经过勘察,一艘德军受创潜艇U-571,正在发出求救信号。S-33的任务是伪装成一艘德军的维修舰,以维修作掩护,从U-571上获取德国最先进的译码设备。不过,由于S-33年久失修,水箱等装备已到服役期,若潜入200米以下恐有危险,但是为了完成任务,泰勒等人还是小心驾驶,偷袭了德国军舰,但正在此时,德军的鱼雷也逼近了U-571,他们命悬一线,生死未卜……