oregon sri yantra sacred hindu geoglyph in the west ?

World is full of mysteries and secrets, even with all the modern communication system many of them still just lie dusted beneath the surface unknown to many one such important mystery that few westerners know but unknown to indians but directly related to Indian culture is "Oregon sri yantra" incident.

it was in 1990 air national guard pilot miller noticed something strange geoglyph on Dry Lake Bed during the fly over the massive formation was said to be a quarter mile almost half a kilometer which was etched into a dry lake bed similar to crop circles near steen mountains 70miles southeast of burns the yantra consisted lines of 10inch in width and 13.3 miles long and 3inches in the hard pan though miller don't know at the beginning what it was later he came to know it was the ancient Hindu meditation icon.

and whats interesting is there was no signs of tire tracks, foot prints or any kind of evidence to claim that it was the work of humans and also it is said the researchers vehicle left 1/4' deep tire tracks on crusty surface of the dry lake bed so what do you guys think is this the work of humans? if so why yantra being such a complex geometrical pattern which is very hard to draw perfectly in one stretch even on the paper? though many believe it is the work of some unknown forces or extra terrestrials soon after the formation a person claimed that he was responsible for the "Oregon sri yantra" but soon it was clear that his claims was baseless when he tried to recreate even a smaller pattern with decent precision...

But one doubt still stays in my mind whether it is a hoax? if any of you know any more information about this phenomena do share with us.