NOVA: Ground Zero Skycraper. NOVA returns to Ground Zero to witness the final chapter in an epic story of engineering, innovation, and the perseverance of the human spirit: the completion of One World Trade Center, the skyscraper rising up 104 stories and 1,776 feet from the site where the Twin Towers once stood. But just as construction hits full speed and the tower rises to its near-final height, a new threat emerges: this time, from nature. As the historic superstorm Sandy bore down on New York, many feared that the still-incomplete structures and the unorthodox architecture of the Memorial would be especially vulnerable to the storm's wrath. NOVA reveals the engineering story behind their remarkable resilience to nature's worst blows. The greatest test is still to come, though: Will the buildings be completed on time under competing business, environmental, and safety demands? And will the final product be a fitting site for national remembrance?