On the evening of June 27, 1980, a DC9 of the private airline Itavia disappeared from radar screens without sending any emergency signal. The aircraft, stabilized in cruise at 7.600 meters above sea level, sank into the Tyrrhenian Trench, between Ponza and Ustica. 81 people lost their lives, including 14 children. There are three hypotheses about the disaster, but none has ever been proven, until the analysis of the findings and documentary material reveals a fourth, chilling possible cause of the disaster.