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It's September 1st, 1944, and Nazi-occupied Warsaw five years into World War II.

Teresa Vilska, a young female liaison officer with the Polish Home Army,

leads a group of 50 men through the Labyrinthine sewage system running beneath the city.

Teresa is in charge of taking them across town to a rendezvous point where the Polish army needs

back up. It's also her job to keep them orderly and silent, which is no easy feat.

Many of the men in the tunnels are not trained soldiers. The majority are simply civilians who

see now as the moment to rise up against their German occupiers. They struggle to keep their

cool in the underground. Frightened by the eerie silence of their strange new surroundings,

some begin to raise their voices. One switches on a flashlight to race of flinches.

She knows the smallest of sounds, the briefest of lights will alert the German soldiers above,

and if found they'll pay with their lives. To race as silences the soldiers around her,

but some brush off her warnings and continue their nervous conversation.

Teresa grabs one man by the collar and tells him she'll shoot him dead if he makes another sound.

The threat is a bluff. She isn't even armed, but the soldiers don't know that.

The men finally fall silent and just in time.

Above them is an open manhole guarded by two German soldiers.

Teresa holds her breath as she silently shuffles through the tunnel and the others follow suit.

Finally, they've made it past the soldiers. The journey is not even half over.

The walls around them shake as bombs draw from German planes overhead.

...