In a war-torn Eastern European borderland, a ruthless businessman Hunt Julian Wadham hires D.C. Ray Stevenson, a former Royal Marine turned mercenary, to assemble a crack team of ex-soldiers—Prior Richard Brake, Jordan Paul Blair, Cotter Ene Frost, Voyteche Julian Rivett, McKay Michael Smiley, and Tak Brett Fancy. Their mission is to guard Hunt on a dangerous journey into no-man's land to investigate a dubious “real estate” venture for a powerful company, though Voyteche insists there is nothing out there beyond the trees and dust.
The convoy drives most of the way by truck through a dense forest, where distant artillery fire roars, jets thunder overhead, and a sudden rush of static knocks out their radios. When they reach a seemingly abandoned bunker complex, Jordan and Tak stay above ground while the others slip inside to scout. A flash of light in the trees—likely sunlight glinting off a scope—triggers gunfire, but the trees reveal nothing and no shell casings, just an eerie quiet. As they locate the bunker’s generator, D.C. and Hunt get the power back online, while Cotter and McKay stumble upon a stark room filled with corpses and a catatonic survivor named Götz behind a projector screen and a Nazi flag.
The mercenaries interrogate Götz to no avail, and the team settles on the theory that local paramilitaries used the bunker to conceal evidence of ethnic cleansing. Jordan suspects there could be a hidden cache of Nazi gold, while D.C. orders a perimeter of landmines in case others come looking for the same prize. Hunt digs through documents and uncovers a back room containing a large device; he hints to D.C. that its purpose is far more than power generation. McKay momentarily glimpses two jackbooted figures standing beside Götz, who then vanish, and Hunt is briefly chased by a disappearing SS trooper, though he mistakes it for a prank. He explains to D.C. that the machine is built to manipulate unified physics fields with near-limitless potential applications.
As McKay experiments with the bunker’s radio, the device begins to emit screeching static and then blasts out a sprawling, unstoppable classical concert that refuses to stop, even when unplugged, until it explodes. That night, a mysterious mist rolls in, strange lights shimmer from the trees, and silhouettes move in the margins of the mercenaries’ vision, untouched by gunfire. A fierce windstorm drives them to seek cover; in the aftermath, Tak disappears and an Iron Cross is left in the place where he fell. Back inside, Jordan shows D.C. a warped German round he pulled from McKay—a WW2-era cartridge that seems unlikely to have been fired from any standard rifle. When D.C. threatens Götz with a pistol, his eyes seem to move in a way that unsettles the team.
Hunt reveals that the company wants him to locate and retrieve the device, which the SS used for reality-shifting, invisibility, and reanimation experiments—an eerie program intended to create an army of unstoppable undead soldiers. The company’s leverage over everyone is explicit: if the team tries to evacuate, hitmen will be dispatched to target their families. Outside, Tak is brutally tortured and killed beyond the perimeter, and Voyteche, isolated, is silently stabbed to death and then found propped up beside Tak’s corpse the next morning. Despite the threat, D.C. orders an evacuation; Cotter slips away to fetch Hunt but is ambushed by an SS trooper who impales him with a pickaxe and crushes his skull. When Hunt shows the surviving mercenaries a tape of the SS experiments, they realize Götz is the Brigadeführer behind the horrors. Prior blasts his brains out, but Götz reanimates and kills McKay, leaving his body to lie outside.
With no choice but to act, D.C., Prior, Jordan, and Hunt resolve to restart the machine in an effort to neutralize the SS and trap them inside the bunker. That night, the undead SS garrison, now led by Götz, launches a full attack. The mercenaries mount a delaying action to buy Hunt time to power up the device. A shockwave from the machine disables the immediate threat, but the device remains unstable, and the assault resumes. Jordan is dragged into a side corridor and savagely killed; a wounded D.C. fights to hold the line long enough for Hunt to escape through the vents, only to be overrun himself. Hunt finds himself cornered in the test chamber by Götz and his men, and is pulled down from behind just as contingency seems lost.
Three days later, a second corporate team arrives to carry out the same assignment, only to stumble upon a silent field of naked, lifeless bodies and one remaining survivor—a lone “breather” amid the ruin. Outside, the clearing brightens again, and Götz nods to his undead troops, signaling that the assault is about to renew, leaving the fate of the mercenaries and Hunt uncertain as the bunker doors close on a cycle of violence that may never end.
