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Practiced mainly in Japan, self-mummification was a grueling process that required a monk to follow a strict 1,000-day diet of nuts and seeds in order to strip the body of fat. A diet of bark and roots would follow for another 1,000 days.

At the end of this period, the monk began drinking a poisonous tea made from the sap of the Japanese varnish tree, normally used to lacquer bowls and plates. The tea caused profuse vomiting as well as a rapid loss of bodily fluids, possibly making the body too poisonous to be eaten by bacteria and insects.

A living skeleton, the monk was then placed in a stone tomb barely larger than his body, which was equipped with an air tube and a bell.

Never moving from the lotus position, the monk would ring the bell each day to let those outside know that he was still alive. When the bell stopped ringing, the monk was presumed dead, the air tube removed and the tomb sealed.

After another 1,000 days the tomb would be opened to check whether the monk had been successfully mummified. Of the hundreds of monks that tried this horrifying process, only a few dozen actually became self-mummified and venerated in temples as a Buddha.