1966年，美国和澳大利亚建立在沙漠深处的一座秘密研究机构与外界失去联系。15小时后，联系彻底中断。为了弄清真相，一队拥有丰富作战经验的特别部队授命前往这座位于地下200英尺的研究所，一方面救出困在里面的科学家，另一方面拘捕霍处死极度危险的罪犯。在逼仄幽暗且危机四伏的空间内，小队成员小心翼翼，步步为营，沿途所见尽是科研人员和保安鲜血淋淋的尸体。未过多久，他们遭到未知火力的猛烈袭击。经历险象环生的侦查后，罗密欧（迪奇·戴维 Ditch Davey 饰）发现一名面色惶恐、没有任何记忆且与他去世妻子容貌极其相似的美丽女子夏娃（Amber Clayton 饰）。 在此之后，身形庞大的恐怖猩猩等诡异生物交替出现在这群战士面前，他们仿佛进入一个永远无法逃脱的异度空间……

Near the end of World War II, the survivors of a torpedoed hospital ship cling to life aboard a crowded lifeboat. With no food, water, or shelter, all seems lost – until an eerily silent German minesweeper drifts ominously towards them, giving them one last chance at survival. As our motley crew explores the ship, it becomes all too clear that some diabolical fate has befallen its German crew. The mystery only deepens when they encounter a young Romanian girl, apparently the sole survivor, who leads them to a locked room in the bowels of the vessel.