On the morning of June 25, 1986, a 10-year-old boy named Juan Pedro Martínez Gómez was riding in a truck with his parents on the Somosierra mountain pass. The truck carrying 20,000 liters of sulfuric acid crashed. Both parents died. But Juan Pedro's body was never found [citation:1][citation:3].

What happened to him remains one of Europe's strangest unsolved mysteries. Was he kidnapped before the crash? The truck made twelve unexplained stops in the final miles of the journey, including one that lasted 22 seconds—enough time, some believe, to take the boy [citation:2][citation:4]. A witness reported seeing a white van at the scene, a tall man and an elderly woman who may have taken a bundle from the truck and driven away [citation:3][citation:7]. Others point to traces of heroin found in the truck and threats the father had received, leading to theories of a drug-related kidnapping [citation:2][citation:5].

Investigators considered the possibility that acid dissolved his body, but experts ruled it out: the acid couldn't have destroyed his remains in that time. The family believes he was taken before the crash, a theory supported by the erratic driving that followed—as if his father was chasing someone [citation:4][citation:7]. Today, with the case cold for 40 years, the family's only hope is that someone with knowledge will speak before they die [citation:4].

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