In 1938, a team of archaeologists from the University of Peking (Beijing) who are conducting a survey caves in Baian Kara-Ula mountains, Tibet found a cemetery in one of the caves are made with a very neat, containing the skeleton-like people in general, except for the skull larger, not comparable with the proportions of her body.
In the same place, a member of the team also found a stone plate 22.86 cm in diameter, lying in a corner of the cave and covered with a layer of dust. At the center of the disk there is a hole and regular scratches on one side of the surface that resembles the shape of written characters are so small. The members of the team that none of them understand the text and save it and then bring together the results of other findings to the University of Peking.

Since then the experts in Peking continued to attempt to solve the purpose of writing. Until 20 years later, Dr. Tsum Um Nui broke the code writing and reading messages that contained him.

The contents of the writing on the disc it tells about the inhabitants of other planets that were damaged aircraft that forced an emergency landing in Baian Kara-Ula mountains. The local residents of local (ethnic Han) are shocked and feel weird with the physical appearance of the newcomers are expected under threat and tried to hunt down and kill them. The newcomers are also contained women and children panicked and tried to save themselves by hiding in a cave where the discovery of the stone plate, but many of them were killed.

Severe damage to the aircraft and isolated location makes them unable to fix the plane. The article also identifies them as the Dropa. Statement written on the stone plate was similar to the legend that is in the local communities, which is about the emergence of beings from space who was thin-headed small but larger.

In 1965, the disc has been found 716 similar stones from the same cave. An expert from Russia named W. Saitsew who continued the research of Dr.. Tsum Um Nui reported that the stone plate is made of a mixture of cobalt and metal type unknown, allegedly was part of a circuit electrical components.

While on a side wall of the cave, also found a picture of the sun, moon, a star that has not been identified and the whole planet is connected by a dotted line. From the survey results revealed that the findings in the cave (including disc stone) has approximately 12,000 years old. Now, the area around the cave where the discovery of stone discs still inhabited by two tribes named Han and Dropa isolated. They are not like the Chinese and Tibetans, even his physical appearance is different from ordinary people, his body thin and weak, do not exceed 1.5 meters tall.