This clip is from a 2004 documentary called The Mystery of the Self-made Mummy about a Buddhist monk who’s body was mysteriously preserved without any evidence of traditional embalming techniques.
4 minutes. Link to Video
The monks were filmed in 1985. For more details see this 2002 article in the Harvard Gazette. From the article:
Some Westerners practice g Tum-mo, but it often takes years to reach states like those achieved by Buddhist monks. In trying to find groups he could study, Benson met Westerners who claimed to have mastered such advanced techniques, but who were, in his words, “fraudulent.”
Benson decided that he needed to locate a religious setting, where advanced meditation is traditionally practiced. His opportunity came in 1979 when the Dalai Lama, spiritual leader of Tibet, visited Harvard University. “His Holiness agreed to help me,” recalls Benson. That visit was the beginning of a long friendship and several expeditions to northern India where many Tibetan monks live in exile.
