The smooth operation and then evacuation of NYU's hospitals during and after Hurricane Sandy were remarkable. But for the future, it's important to understand what medical and public health challenges are to be expected after such megadisasters. Within hours after Hurricane Sandy's landfall, doctors and staff at one of New York City's premier medical centers realized that something was going terribly wrong. Lights were flickering, critical devices essential to life support for more than 200 patients, many in intensive care units, were malfunctioning. A decision had to be made by hospital leaders, senior public health officials, and emergency responders: tough it out in a hospital without power or attempt a perilous patient evacuation as an epic disaster unfolded. With little time to lose, the “go” order was given, followed by frantic calls to high-ground hospitals identifying beds . . .