Former New York City Mayor Rudy Giuliani told an amazing story this morning at the dedication of the 9/11 Museum in lower Manhattan. Giuliani introduced former New York City firefighter Mickey Kross and 11 other first responders who miraculously survived the collapse of the North Tower and were rescued by their colleagues.

In the video above, hear from Giuliani and former Lt. Kross, who said many of those who were rescued immediately joined the rescue and recovery effort at Ground Zero "to do for others what had been done for us."

"We had to. We had come together at Ground Zero to help each other out. There was a real sense of caring for one another. This is something we should never forget and never stop doing," said Kross.

'A Man in a Red Bandana': Obama Recounts Story of Heroism at 9/11 Museum Dedication