There are a number of bodies on display in temples in northern Japan.  They were Buddhist monks who, after a decade of ascetic practices, decided to bury themselves alive.  There are currently more than twenty mummified bodies on display as objects of worship in various parts of Japan.  They are dressed in priestly robes, as though alive, and they are known as sokushinbutsu: Living Buddhas.This is relatively unknown practice, and there are only a few books on the subject.  There are three or four books in Japanese, one in Italian, and only one in English.  The following is a link to the English book:     http://www.mcfarlandpub.com/book-2.php?id=978-0-7864-4880-7  
The mummified remains of Enmyokai Shonin,
located in Sakata, Japan


The body of Shinnyokai Shonin, found in Oaminaka, Japan

The body of Chukai Shonin,
on display at Kaiko Temple

Togashi Kichihyoei (1623-1683) was a samurai in the Sendai Fief.  He turned to religion c.1660 when his lord, the daimyo of Tsuruoka, became gravely ill.  The samurai prayed for his lord's recovery, and he was miraculously cured.  Kichihyoei took the religious name Honmyokai, and he decided to bury himself alive.