On the evening of 23 January 1974, the villages of Llandrillo and Llandderfel in the Berwyn Mountains of North Wales were shaken by something nobody could immediately explain. People heard a huge bang, felt the ground tremble beneath their feet, and saw a brilliant light in the sky above the mountains, falling to earth and glowing on a hillside. Police and soldiers were sent to the scene. Within days, the incident had a nickname in the newspapers: the Welsh Roswell. More than fifty years later, the argument over what happened that night has still not ended — even though the official files have been opened and the scientific evidence is on the record.
The Berwyn Mountains rise in the north-east of Wales, a range of moorland and steep-sided valleys in what was then Merionethshire. The highest peak, Cadair Berwyn, stands above the villages that cluster in the valleys below. On that January evening, at about 8:30 p.m., residents reported a loud explosion followed by earth tremors that rattled windows and shook houses. Others claimed to see a brilliant light streaking across the sky over the mountains, falling to earth and glowing on the hillside. The first fear was that an aircraft had crashed. Police converged on the area, and an RAF search and rescue team was scrambled from Anglesey.
Among the people who went toward the light was Pat Evans, a district nurse from Llandderfel, who drove into the mountains with her daughters, believing she might be needed if there had been a crash. She later said she saw an elongated object with a red glow lying on the hillside, with smaller lights moving nearby. Her account, given in interviews many years later, became the most quoted witness testimony of the incident. Huw Lloyd, then fourteen years old and watching television at home, later recalled the tremor shaking his house violently and a blinding light filling the countryside.
What the Instruments Recorded
Two things were measured that night, and both are matters of record. The Institute of Geological Sciences, now the British Geological Survey, reported that a magnitude 3.5 earthquake was felt at 8:38 p.m. over a wide area of northern Wales, reaching as far as Formby in England, about thirteen miles north of Liverpool. A seismic event of that size produces exactly the kind of bang and shaking the villagers described. And a bright meteor — a fireball — was widely observed over Wales and northern England that evening, seen by witnesses across a large area and travelling, according to the British Astronomical Society’s investigation, from north-west to south-east.
The declassified Ministry of Defence documents, released by the National Archives in 2007 and 2010, set out the official conclusion: the incident was caused by the combined effects of the earthquake and the meteor. The MoD files record that the authorities received a number of reports of an unusual object in the sky just before 10 p.m. that evening, consistent with the meteor’s visibility, and that five other UFO sightings elsewhere in Britain that night were also consistent with it. No wreckage was found, no crater was found, and no military retrieval operation was recorded in any released file. The seismic evidence supports this: had the recorded shock waves been caused by an aircraft crash, the impact would have produced a large crater. None was found.
The Crash Story
That explanation satisfied almost no one who had been there. The crash story grew quickly. Witnesses said roads were sealed off and people kept away from the site. It was claimed that alien bodies had been recovered and taken to Porton Down, the biological warfare research centre, or to Rudloe Manor, a former RAF base in Wiltshire that was the UK’s centre for UFO investigations in the 1950s. The television programme Ancient Aliens later speculated that a UFO crashed at Berwyn and its wreckage was taken to Rudloe Manor. None of these claims appears in any official document.
Other details were added over the years. The researcher Paul Devereux said his colleague Keith Critchlow had spoken with scientists investigating the mountain who carried a Geiger counter giving off extraordinary readings on the slopes of Cadair Berwyn. The sceptical researcher Andy Roberts, who re-investigated the case in depth, pointed out that such readings have no scientific relevance without readings taken before the event for comparison. Roberts also found no evidence for a reported leukaemia cluster in the area. Within months of the incident, UFO investigators began receiving official-looking documents from a group calling itself the Aerial Phenomena Enquiry Network, claiming that an alien spacecraft had crashed on the Berwyn Mountains and been retrieved by a crash-retrieval team. Those documents are now widely regarded by serious ufologists as a hoax perpetrated by ufologists on ufologists.
The timing also matters. The earthquake was recorded at 8:38 p.m., while the meteor was seen later in the evening, around 10 p.m. In some witness accounts, the shaking came before the lights, which fits two separate natural events on the same night rather than a single crash. The official explanation requires a coincidence — an earthquake and a bright meteor on the same evening, in the same part of the country. Coincidences of that kind do happen, and they are exactly the kind of thing that creates a mystery: two real, documented events, arriving together, looking like one impossible one.
The Berwyn incident endures because it sits in the gap between what was measured and what was felt. The earthquake was real. The meteor was real. The fear of the villagers that night was real. Whether anything else fell on the Berwyn Mountains on 23 January 1974 is a question the record does not answer — and the absence of wreckage, of a crater, and of any retrieval order in the declassified files is itself evidence, of a kind, that nothing did.
What Is Documented — and What Is Not
Documented: On 23 January 1974, residents of Llandrillo and Llandderfel in the Berwyn Mountains, Wales, reported a loud bang, earth tremors and a bright light in the sky. The Institute of Geological Sciences recorded a magnitude 3.5 earthquake felt at 8:38 p.m. over a wide area of northern Wales. A bright meteor was widely observed over Wales and northern England that evening. Police and an RAF search and rescue team responded to fears of an aircraft crash; no wreckage or crater was found. Declassified Ministry of Defence documents, released by the National Archives in 2007 and 2010, attribute the incident to the combined effects of the earthquake and the meteor. District nurse Pat Evans reported seeing a glowing elongated object on the hillside.
Not documented / unverified: No evidence supports the claim that an alien craft crashed, that bodies were recovered, or that wreckage was taken to Porton Down or Rudloe Manor; no such operation appears in the released files. The Aerial Phenomena Enquiry Network documents claiming a crash retrieval are widely regarded as a hoax. The Geiger counter readings reported by Paul Devereux’s colleague lack baseline measurements and prove nothing. The reported leukaemia cluster was not substantiated when re-investigated. The earthquake and the meteor occurred at different times that evening, and the official explanation depends on their coincidence — a point both sides of the argument continue to dispute.