Argentina: UFO at Sierra de la Ventana
The attached photograph was taken at Sierra de la Ventana, Province of Buenos Aires, in an effort to take a photo of the hole that gives its name to this system.
Prior to taking the photograph, the witnesses heard a strong, whistling and penetrating sound and tried to see if there was a jet aircraft in the area, but were unable to locate it.
The image was taken with a Vivitar N3000 camera and a roll of ASA 200 film.
(translation (c) 2006, Scott Corrales, IHU. Special thanks to Raul Oscar Chaves)