On 17 December 1967, Harold Holt, the immensely popular prime minister of Australia, went for a swim -- and vanished. In the decades since, his family and the public still have questions about what exactly happened. In tonight's episode, Ben, Matt and Noel explore a mystery that remains unsolved in the modern day, along with a meditation on empathy, and a bevy of increasingly bizarre conspiracy theories.

What's Happening in Iran?
58:25

CLASSIC: The Mystery of the Kensington Runestone
1:01:38

The Subterranean Secrets of Denton, Texas
1:04:29