Researcher Robert Lesniakiewicz was out in a wooded area looking for mushrooms when suddenly he felt an unusual quiet in the area, the birds seemed to stop singing and the insects had stopped chirping. Almost simultaneously he heard a whistle coming from somewhere in front of him that was initially high-pitched and then declined in volume. He noticed an "invisible" something or somebody that seemed to be parting some tree branches just about 30 meters from his location. Seconds later he heard a second identical whistle, this time coming from behind him. Lesniakiewicz had the distinct impression that someone invisible was stalking him and trying to surround him. He could feel whistles and movement all around him but could not see anything physical. After a few terrifying minutes everything suddenly returned to normal, with the familiar bird and insect sounds now back in focus. He searched around but could not find any logical explanation as to what had occurred. (Brings to mind the attack on a woman by invisible "aliens" in the Lorie Valley, France back in 1950).

Google map of this location.