Years after the horrifying events in the New Mexico desert, a remote
military training outpost becomes the setting for a fresh nightmare. A National Guard unit consisting of rookie soldiers and their hard-bitten Sergeant, Napoleon, arrive to deliver vital equipment and supplies to a team of scientists constructing a communications relay. However, upon arrival, the base is eerily deserted. The only clue to the personnel's whereabouts is a distress signal flashing from a nearby mountain range.Determined to locate the missing scientists, the green troops venture into the vast, unforgiving hills, completely unaware that the mutated, cannibalistic survivors of the original massacre still lurk within the labyrinthine mine shafts. The soldiers are ill-prepared for the brutal psychological and physical terror that awaits them. As the squad splits up to cover more ground, they are systematically hunted down by the deformed inhabitants, who view the intruders as trespassers trespassing on their hunting grounds and potential breeding stock.One by one, the soldiers fall victim to sadistic traps, crossbow bolts, and brutal hand-to-hand combat. Fear fractures the unit, testing the loyalty and courage of the survivors. Sergeant Napoleon sacrifices himself heroically to buy his subordinates time, while the remaining recruits are forced to shed their naive civilian mentalities and embrace a primal, violent
survival instinct. Among the survivors are Amber, a compassionate medic, and Crank, a hot-headed soldier whose aggression matches the hostility of the terrain. They must push past their terror, injuries, and grief to navigate the claustrophobic darkness of the mines.Deep underground, the captives discover the horrific fate of the scientists and realize the mutants are not just killing them, but planning to impregnate surviving female soldiers to perpetuate their bloodline. This revelation drives the survivors into a frenzy of desperate retaliation. Utilizing military tactics, improvised weaponry, and sheer grit, Amber and Crank turn the tables on their tormentors. They unleash explosive firepower and engage in a ferocious, bloody showdown against the mutated patriarch and his savage offspring.After barely escaping the collapsing tunnels and detonating the explosives to seal the mines, the battered and traumatized survivors emerge into the blinding desert sunlight. Though they have survived the night, the psychological scars run deep, forever haunted by the monstrous cruelty hidden within the silent hills.