Operation Mainbrace and the 1952 RAF Topcliffe UFO Report
On 19 September 1952, five RAF aircrew at Topcliffe reported a silver circular object descending, rotating and accelerating away. The surviving British archival record makes this a significant military-witness case—but not a documented radar intercept or proof of extraterrestrial technology.
[ PRIMARY CITATION // NATIONAL ARCHIVES (NARA) · CTD-0065 ]
WITNESSES & UNITS
Archival case investigatorsSENSORS & EVIDENCE
Ground / airborne radar track
Archived investigative case file