In 1947, an British flight from Buenos Aires, Argentina to Santiago, Chile reported their status over Morse code as “ETA SANTIAGO 17.45 HRS STENDEC”. That last word is nonsense, so the tower asked for clarification. They repeated: STENDEC. STENDEC.
They were never heard from again. 11 people vanished, apparently along with their plane, and the only clue is that last word.
And no one knows what the fuck “STENDEC” means.
Just checked the wiki. The wreckage was discovered by some hikers in the late 90s and body parts have been confirmed to be some of the victims. The wreckage had been covered in an avalanche and was incorporated into the glacier which is why it wasn’t found at the time by search teams.
Most likely explanation for STENDEC is the spacing on the Morse code being off, but we can’t be sure.