Backup generators failed, the hospital evacuated, and nurses were seen carrying babies in their arms during the storm, some of the newborns in incubators.
Their families and babies are now a year older, and celebrating.
"I remember my exact words," said parent Tamar Weinstock. "I know this is the worst possible time, but my water just broke."
Tamar wasn't due until late November, but on Oct. 29th, she was seconds away from giving birth to her baby boy Stone.
Outside NYU Langone, Superstorm Sandy tightened its grip on our area.
Officials were forced to evacuate more than 300 patients, as back up generators weren't working.
"You just know you're getting a baby so that's all that matters," said Weinstock.
Exactly one year later, some of those very same parents and little ones gathered to mark this milestone.
Julz Donald gave birth to her daughter Freda, the morning Sandy rolled through. Later that evening, when the lights went out: "I was asked, can you walk?," Julz said. "I said yes but didn't realize the question was, can you walk down 13 flights of stairs, cause my answer would have been quite different."
Then there is Little William, one of several babies, who needed extra special care.
He was recovering from heart surgery, just days before had been taken off a ventilator.
Dr. William Schweizer was right in the thick of things.
"My son was talking about it to his classmates two days later and they cheered him and when he came home and told me that story, it only hit reality, the impact of what we did that night," said Dr. Schweizer.
They stepped out of their normal roles to make sure each and every patient was safe.
"In the lobby it was like a scene out of DieHard, that's when it hit me it was quite serious," said Donald.
These families no doubt share a special bond, and oh, the stories they will one day tell.
"It makes you feel good, makes you feel satisfied that you helped these babies come into the world in a way," said NYU Langone's Jim Orlando.
And we're told most of the infants slept through the entire ordeal.