In September 2007, record-breaking aviator Steve Fossett went missing somewhere over the Sierra Nevada mountain range, sparking the biggest peacetime search and rescue operation in the history of the United States. Over the ensuing days and weeks, reports would surface of a half dozen other missing airplanes in a huge triangular area of California and Nevada. Some of the planes dated back to the early days of flight, and others were from the Second World War. Could this mysterious region be another Bermuda Triangle? National Geographic braves the treacherous weather and deadly winds of the range to uncover what really happened to Steve Fossett and reveal the secrets of the Nevada Triangle.