The Miracle of Stairway B is a 2011 documentary which tells the story of how 12 firefighters, a police officer, a bookkeeper, an engineer and an office worker survived the collapse of the North Tower on 9/11 despite being on the 22nd floor inside the building at the time.
They found themselves trapped in a small pocket having been on the staircase at the time of the North Tower’s collapse, they were eventually found and rescued by emergency services in the aftermath, Stairwell B is commonly referred to as the ‘Survivors’ Staircase’. If you want to learn more about the survivors and their experience after watching this documentary check out this awesome NYMag.com article.