The Dropa (also known as Dropas, Drok-pa or Dzopa) are, according to certain controversial writers, a race of dwarf-like extra-terrestrials who landed near the Chinese-Tibetan border some twelve thousand years ago. Skeptics note, however, a number of problems with the case (and a lack of corroborative evidence), which offers significant doubt as to the reality of the more sensationalistic Dropa claims. Mainstream critics argue that the entire affair is a hoax.
Alleged Discovery -- Chi Pu Tei, a professor of archaeology at Beijing University, and his students were on an expedition to explore a series of caves in the pathless Himalayan mountains of the remote Bayan-Kara-Ula in Qinghai on the border of China and Tibet. The caves may have been artificially carved to be a system of tunnels and underground storerooms. The walls were squared and glazed, as if cut into the mountain with great heat.
There were no epitaphs at the graves, but instead hundreds of one foot wide stone discs ("Dropa Stones") were found having 3/4 inch wide holes in their centres. On the walls were carved pictures of the rising sun, moon, stars, the land, mountains, and lines of pea-sized dots connecting the earth with the sky. Along with the discs, the cave drawings had been determined to be about 12,000 years old.
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Also see The Dropa tribe and their stone discs revisited on philipcoppens.com