Black UFO at Chitose Air Base, Japan, 1957

Summary

In September 1957, a photographer at Chitose Air Base in Japan captured an image showing a dark blotch in the sky. The object appeared as a shadow moving from left to right, visible for only 2-3 seconds. Although the report did not identify the object as a balloon, aircraft, or astronomical phenomenon, it noted that the blotch had no defined edges and showed no details. This suggested it was not a flying object, but a flaw in the film. During the development process, the film's emulsion had touched some part of the developing tank, causing partial or complete lack of exposure.

The investigation concluded that the phenomenon had no clear explanation beyond a technical error. Despite inquiries to local air traffic control units, there was no confirmation of unidentified aerial activity in the area. The report was filed without a conclusive evaluation, but with the clear indication that the object was not a supernatural phenomenon, but a photographic artifact. This case is a classic example of how technical flaws can generate UFO reports that, upon analysis, have no basis in real objects.