Project 10073 Record Card: Sighting over Madrid, Spain, 14 July 1955

This document details an Unidentified Flying Object (UFOB) sighting reported by two American physicians vacationing in Madrid, Spain, on 14 July 1955. The witnesses, both medical doctors, were writing letters on the open-air patio of the Castellana Hilton Hotel when they observed a perfectly round, solid object moving from the northwest to the northeast across the sky. The object, estimated to be 100-200 feet in diameter, appeared black, briefly turned a chocolate color, and then returned to black. It maintained an unswerving course before accelerating to a speed estimated at 1,000 mph as it disappeared over the eastern horizon. The witnesses reported the event as being completely silent, with no visible lights, wings, or exhaust trails. One of the witnesses attempted to photograph the object using an Argus C-3 camera, though the resulting film was later deemed insufficient for detailed analysis. The witnesses were initially skeptical of 'flying saucers' and expressed concern that reporting the incident might lead to ridicule, yet they felt a duty to inform the Air Technical Intelligence Center. The investigation was conducted by Flight 1-C of the 4602d Air Intelligence Service Squadron. The investigators interviewed the witnesses in November 1955 and reviewed the photographic evidence. The final evaluation by the Air Technical Intelligence Center concluded that the incident was a 'possible aircraft,' noting that while the observers were reliable, the lack of multiple observation points made a definitive identification impossible. The report includes the original correspondence from the witnesses, the completed U.S. Air Force Technical Information Sheets, and the final evaluation by the Air Technical Intelligence Center.