The Lead Masks Case: The Experiment That Never Finished

Kat Has Questions: True Crime and Unsolved Mysteries · Jan 21, 2026 · 16m

In 1966, two electronics technicians traveled to a hill overlooking Rio de Janeiro — and were later found dead, lying side by side, wearing homemade lead masks over their eyes.There were no signs of violence. No clear cause of death. And no explanation for why they were there.In one man’s pocket, police found a handwritten note with strange instructions: a time, a reference to ingesting capsules, a warning to “protect metals,” and a final line — “await signal.”In this episode of Kat Has Questions, we dive into the bizarre and unsettling mystery known as The Lead Masks Case. We explore the…