Return 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. “Ground Zero Supertower” examines the new skyscraper rising up 104 stories and 1,776 feet from the site where the Twin Towers once stood. In this update of NOVA’s Emmy-nominated special “Engineering Ground Zero,” NOVA goes inside the construction of the tower’s final floors and the installation of its soaring, 800-ton spire and beacon. NOVA also goes underground to see another engineering marvel taking shape here: the construction of a museum that will house artifacts from 9/11. The greatest test is still to come, though: Will the final product be a fitting site for national remembrance?