On a winter night in 1974, an enormous explosion echoed across the Berwyn Mountains. The ground shook, lights blazed in the sky, and terrified residents reported something crashing into the hills. But when police officers, RAF teams, and mountain rescue volunteers searched the area, they found nothing. No wreckage. No impact site. No answers.

In this episode, we dive into one of Britain’s most persistent unsolved mysteries. I take you through the eyewitness testimony that still divides researchers, the Ministry of Defence’s later involvement, and the strange contradictions in their account. Was it a routine geological event, a military cover-up, or something far stranger?

Fifty years on, the Berwyn mystery remains exactly that. A mystery. And tonight, we’re going to sit in that uncertainty, sift through the evidence, and ask what really happened on that mountain.