Un joli trucage.
Premièrement pourquoi? A cause du copyright indiquant ce site situé à la fin:
http://www.australianufowave.com/
Ce site organise des "projets" à propos des OVNI, le but étant d´être le plus réaliste possible.
Et maintenant une petite explication à propos de cette vidéo.
http://www.australianufowave.com/ufo29.html
"I had some spare helicopter footage (from a previous project), and thought it would make for an interesting shot. I modelled this on the famous Mexican footage, expecting that the numerous clues that were left in the clip would expose the nature of our project. To my amazement, hits at the site went through the roof, and this proved to be the most popular clip so far. Lots of people identified the location and date, and even the type of infrared camera this was ´shot´ with - but nobody noticed that this isn´t actually an infrared image (only an inverted one), or that the camera readouts are inaccurate. After a few weeks, some people noticed that the UFO is animated independently of the background."