Swissair Flight 111 goes down in the Atlantic off Nova Scotia on September 2, 1998, killing all 229 people aboard, and this NOVA film follows the investigation that took four years and nearly $40 million to complete. Crash detectives face a debris field scattered across the ocean floor in roughly two million pieces, and the film shows them collecting, sorting, and trucking wreckage into a hangar where they rebuild a large section of the fuselage piece by piece. Hope that the flight data recorder and cockpit voice recorder would explain everything collapses when investigators discover both stopped recording during the plane's final six minutes, leaving the last moments to be reconstructed from physical evidence alone. NOVA gets access most outlets did not, following the team as they trace the disaster to wiring and insulation problems that, the film notes, were still present on other aircraft when the investigation closed. The recommendations that follow are as much about the industry's next accident as this one.