Traces of unknown drilling technique in the shape of a heptagram were encountered in many countries, such as Norway, Australia, United Kingdom and even in South and Central America.
Origin and function of the heptagram shape which resembles a star is still mysterious. The theory behind this strange star shaped hole drilled inside a rock is that it gives us proof of innovative technology which existed in ancient times.
Ever since the first sighting in 2007, many geologists, engineers and scientists have been trying to provide a logical explanation on how these star shaped holes were drilled. The technology and equipment which was used is still unknown. The hole is about 6 cm in diameter with smooth seven sides and is completely symmetrical.
These holes serve to prove that ancient civilization had used an advanced technology which is up to this date unknown to the humankind.