On September 4, 1971, members of the Instituto Geográfico Nacional (National Geographic Institute) took photographs above Lake Cote for the Costa Rican governmental company that provides electricity and telecommunication services. The photographs were taken for the construction of a hydroelectric dam near lake Arenal, when the mapping agency members accidentally captured a UFO in their high-resolution camera that was mounted on the plane, pointing downwards. The photograph is considered to be the clearest and best UFO photograph ever taken.
Sergio Loaiza, Juan Bravo and Francisco Reyes were flying in a Canadian-made Areo-Commander model F680 piloted by Omar Arias, and Loaiza was in charge of aerial photography that day. They were flying above Costa Rica with a 100-pound map-making camera when Loaiza captured a photograph of a metallic disc like a typical alien “flying saucer” that can be seen flying between the F680 aircraft and the ground.
They were flying at 10,000 feet, mapping the landscape beneath with the high-resolution camera that was programmed to take photos every 20 seconds. While reviewing the negatives, Loaiza could not believe his eyes. He even said that they were completely banned from talking about it. According to UFO researcher Oscar Sierra, the photographs were analyzed in the USA and France and found to be 100% real.
The object can only be seen in the photograph in frame number #300 in the sequence, and there is no indication of it in either the frame of film that came before it or the one that was taken immediately after it. Due to the film stock and the quality of the camera, the image was incredibly clear. This object was not in either the frame before it (#299) or the frame after it (#301).