Something I just discovered: Harold Holt, Prime Minister of Australia from early 1966 until late 1967, disappeared while swimming near Melbourne on December 17, 1967. His body was never recovered, leading to a conspiracy theory that he was abducted by a Chinese submarine. John McEwan succeeded him as Prime Minister.
This is rather the opposite of another famous Australian death: the Tamam Shud case, for which there was a body, but no identity. An unidentified man was found dead on Somerton Beach near Adelaide on December 1, 1948. He carried nothing that revealed who he was, and even the tags on his clothing had been removed. An autopsy revealed no obvious cause of death. The mystery deepened when on January 14, 1949, a suitcase likely belonging to the man was recovered from the Adelaide railway station, which contained a number of things, none of which could help establish who he was. Shortly after that, a tiny piece of rolled-up paper was found in a fob pocket in the man’s trousers. It had been cut out of a book and bore the words “Tamam Shud” – Persian for “ended” or “finished,” the final words of the Rubaiyat of Omar Khayyam. Following a public appeal, the edition from which the paper had been excised was found – along with indentations from handwriting on the inside of the back cover reading:
What this means has never been satisfactorily explained, and the identify of the Somerton Man and the circumstances of his death remain a mystery.