The United States government has declassified four videos showing unidentified aerial phenomena (UAPs) recorded by military aircraft. The footage, released by the Pentagon’s All-domain Anomaly Resolution Office (AARO), depicts objects performing manoeuvres that defy conventional aerodynamic understanding. In response, British defence analysts at the Royal United Services Institute (RUSI) have urged the UK government to collaborate with US authorities on a joint transatlantic investigation.
The videos, captured between 2019 and 2023 by US Navy and Air Force sensors, show objects accelerating rapidly, hovering at altitudes exceeding 30,000 feet, and executing turns at forces beyond human tolerance. One clip, designated ‘Gimbal II’, shows a cylindrical object rotating against the wind while emitting no visible exhaust. Another, ‘Calvine Revisited’, reveals a diamond-shaped craft descending from the stratosphere at an estimated speed of Mach 3.
Dr Meredith Harper, a physicist at the University of Cambridge specialising in atmospheric phenomena, described the footage as “empirically significant”. She stated: “These objects exhibit no wing surfaces, no propulsion signatures, and no heat plumes. They are doing physics we do not yet understand.” Her assessment aligns with a confidential RUSI briefing circulated to Whitehall last week, which classified the sightings as “high-priority anomalous events”. The document warns that the UK lacks dedicated sensor infrastructure to independently verify such data.
“The US has spent decades collecting this data because their pilots reported near misses and safety incidents,” said Air Vice-Marshal Sir Julian Hartley (retired), a former director of UK Air Defence. “We cannot afford to treat this as a novelty. If these objects are real and physically unaccountable, they represent either a foreign technological breakthrough or a gap in our understanding of the natural world. Both require urgent transatlantic cooperation.”
The call for joint investigation echoes a similar appeal from the US House Intelligence Committee, which in 2022 established a permanent UAP reporting mechanism within the Office of the Director of National Intelligence. However, sceptics argue that the phenomenon could be explained by misidentified sensor artefacts or atmospheric reflections. Dr Vance notes that the US government has consistently refused to describe these objects as “extraterrestrial”, instead labelling them “unknown”. The language is precise: the ambiguity lies in the data, not the hypothesis.
The UK’s Ministry of Defence has historically been reluctant to discuss UAPs, citing limited resources and the absence of evidence for foreign incursions. But the RUSI briefing challenges this stance, recommending the formation of a joint taskforce under the Five Eyes intelligence alliance. “The cost of ignorance is higher than the cost of investigation,” reads the document. “If these objects are demonstrations of novel propulsion by a peer adversary, the strategic implications are severe.”
Public interest has surged alongside the declassification. The UK’s UAP reporting hotline, dormant since 2009, received 1,200 calls in the week following the release. Social media platforms are rife with speculation, but the scientific community remains cautious. Dr Vance underscores the need for rigorous analysis: “We have seen this cycle before. A video surfaces, the internet buzzes, then the data is lost. This time, the US has released raw sensor logs alongside the footage. That is unprecedented. It allows independent verification.”
So where do we go from here? The next logical step is for the UK to deploy its network of ballistic missile early-warning radar at RAF Fylingdales in North Yorkshire to cross-reference US data. If the same objects appear over British airspace, the case for a transatlantic study strengthens. If not, the data may reveal a limitation in US sensor networks. Either outcome advances our understanding.
The declassification has ignited a necessary conversation. It is not about aliens. It is about the quality of evidence and the humility to admit that our models of the physical world may be incomplete. A joint investigation that treats the data with the same rigour as climate research or particle physics would serve both national security and fundamental science.
