I'm Coming For You, Brother

S1 E5: First responders look at the vast pile of debris at ground zero and wonder how anyone could still be alive. But one group of firefighters who were inside the north tower as it collapsed managed to survive miraculously. Now they are trapped, and as they radio “mayday” for help, other firefighters must race against time to locate and rescue their “brothers” in a dangerous and unstable ocean of rubble.