CIA agent Sean Davidson and his sidekick Carl are sent into the stronghold of sadistic British ex-soldier Mulgrew to rescue some Delta Force commandoes who have been captured and tortured. When Sean, Carl and pretty doctor Sarah run into some problems, Peace Corps vet Joe Armstrong is lured out of retirement to stop Mulgrew's plan to explode a nuclear device in New York City.

In a seedy bar in a town ravaged by war, mysterious businessman Hunt hires ex-marine D.C. to assemble a crack team of ex-soldiers to protect him on a dangerous journey into no-man's land. To this gang of hardened warriors, battle-worn veterans and borderline criminals killing is just a job - and one they enjoy. Their mission - to scope out an old military bunker. It should be easy - 48 hours at the most. Lots of cash for little risk, or so he says. Once at the outpost, the men make a horrific discovery that turns their mission on its head - the scene of a bloody and gruesome series of experiments, carried out by the Nazis on their own soldiers during WWII. Amid the carnage, they find something even more disturbing - someone who's still alive. As war rages above ground, and a mysterious enemy emerges from the darkness below, D.C. and his men find themselves trapped in a claustrophobic and terrifying scenario...