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Here is the Shingon-approved self-mummification process in a few easy steps.
For three years, eat nothing but nuts and berries.
For the next three years, only eat bark and roots
Drink a special tea. By drinking tea made out of urushi tree, a substance which
is poisonous and usually used to lacquer bowls. The latter supposedly made
the body bacteria proof.
Bury yourself alive.
Seal yourself in a giant stone tomb. The monks gave the mummy-to-be a bamboo pipe for air and a bell to rang it every day so the fellow monks know that he was alive. When they didn’t hear the bell ring, they knew that the monk had died.
It is not clear however if Inaoka followed any of these process but it was recorded that by the end of the performance during which he fasted for several days being on the display of the exhibition he lost as much as 18kg. The group claims that the artist was fine after the end of the whole ordeal.