In October 2012, Megastorm Sandy cut a path of devastation across the Caribbean and the East Coast, killing hundreds and doing tens of billions of dollars in damage. To many, it was a wake-up call. Now, one year after Sandy's deadly strike, NOVA follows up on the 2012 film "Inside the Megastorm" with a fresh investigation of the critical questions raised by this historic storm: Was Megastorm Sandy a freak combination of weather systems? Or are hurricanes increasing in intensity due to a changing climate? What can we do to prepare ourselves for the next Sandy, and what progress has been made toward making our urban infrastructure more resilient? Much of Sandy's wrecking power was due to an extreme storm surge that left large swaths of New York and New Jersey underwater. And with sea levels on the rise, flooding will only become more frequent. NOVA examines the role of climate change in driving these rising seas, and looks at some of the latest extraordinary engineering employed in other areas, as well as what it may take to make cities like New York more resilient in the future