When a secret military border post falls silent an army team is dispatched overnight to re-establish contact & safely retrieve the son of the Army Chief of Staff who is posted there What they find is so shocking that HQ orders GP506 to be burnt to the ground at dawn
- incinerating the evidence The investigative team are left with just eight hours to explore the maze-like underground tunnels find their target & uncover the truth Time is running out but the terror that has engulfed GP506 has only just begun