#24: The Mysterious Disappearance of an Australian Prime Minister
In 1967, despite his confident swimming abilities, Australian Prime Minister Harold Holt disappeared while swimming at Cheviot Beach, Victoria. His fate remains a mystery despite a $500,000 search involving the Australian Army, Navy, and more.

Efforts to locate Holt became one of Australia’s largest rescue operations, involving over 200 people, yet he was never found. Among various theories, one suggests Holt was a Chinese spy spirited away by a submarine, adding intrigue to his unsolved disappearance.