14 Terrible Things That Have Happened on Friday the 13th
Swedish flight DC-3 vanished and was never heard from again.
According to National Geographic, a Swedish flight disappeared while flying over the Baltic Sea on June 13, 1952. And for 40 years, the Swedish government stuck by the story that the plane was merely performing training exercises.
However, National Geographic reported that in the ’90s it was leaked that the crewmembers were actually spying on the Soviet Union for NATO – even though Sweden was officially neutral during the Cold War. And Russia responded with its own confession. A Russian pilot told a Swedish diplomat that he had shot the plane down.