While the allied nations fight back against the Third Reich in the spring of 1945, an American Army base in Poland is ambushed, leaving only five US soldiers alive. After spotting enemy reinforcements on the horizon, they find a trap door leading to an underground series of tunnels into the unknown.
The SS hot on their tail and a maze of passageways before them, the Americans must rely on an escaped Jewish girl to help them find their way to freedom.
