In the years following World War II, Lena, a determined NATO investigator with a personal vendetta, delves deep into Eastern Europe to track down a notorious Nazi war criminal. Her pursuit leads her to a mysterious, abandoned bunker complex rumored to house remnants of a horrific experiment conducted by an evil commander during the war. In the midst of her investigation, Lena encounters Wallace, a fellow researcher obsessed with uncovering the secrets hidden within the bunker. Together, they uncover a labyrinth of sinister technology and discover that the experiment aimed to resurrect dead soldiers, creating immortal, indestructible super-soldiers.

As Lena and Wallace delve deeper into the bunker’s dark corridors, they quickly realize that it's not entirely abandoned. They come face-to-face with resurrected Nazi soldiers who violently protect the bunker’s secrets and its nefarious past. The grisly truth behind the experiments and their horrifying implications for the future unfolds as they try to survive the relentless onslaught. In a battle against time and the undead, Lena and Wallace struggle to destroy the sinister technology and prevent a catastrophic surge of immortal soldiers that could doom humanity.