It's been made from unseen footage, mainly by amateurs on handheld cameras and phone video footage, and also using fire crew footage. It's showing the real reactions in a realtime time scale and is really quite chilling to watch.
without feeling some pretty powerful emotions. I went there two years after the event, and I found myself feeling very moved. You can't stand there without thinking that this is the place where so many people died in horrendous circumstances.