The calls started coming in late on Tuesday and early Wednesday: offers of dry ice, freezer space, coolers. By the end of Thursday there were dozens more: A researcher at Weill Cornell Medical College would clear 1,000 tanks to save threatened zebra fish; another, at Cold Spring Harbor Laboratory, promised to replace some genetically altered mice that were lost; and a doctor at the Children’s Hospital of Philadelphia even offered take over entire experiments, to keep them going.

As hurricane-driven waters surged into New York University research buildings in Kips Bay, on the East Side of Manhattan, investigators in New York and around the world jumped on the phone to offer assistance — executing a reverse Noah’s ark operation, to rescue lab animals and other assets from a flooding vessel.

“I’ve had 43 people who have offered to help so far, and some of them are direct competitors,” said Gordon Fishell, associate director of the N.Y.U. Neuroscience Institute, who lost more than 5,000 genetically altered mice when storm waters surged the night of Oct. 30, cutting off power. “It’s just been unbelievable,” he said. “It really buoys my spirits and my lab’s.”

Staff members at N.Y.U. worked around the clock to preserve research materials, running in and out of darkened buildings without elevator service, hauling dry ice and other supplies up anywhere from 2 to more than 15 floors.