>>587118
That mummy from the picture was a Thai monk. And that place is blazing hot and humid.
>>587115
From what I have see, they do but very slowly. Sokushinbutsu practise is to achieve that when still alive and they do through special diet and aim to pass away during meditation. The pic related was also passed away during meditation. As per the belief and your post itself.
>These are venerated by "some" Buddhists
>controversial and contradictory to the Buddhist belief in impermanence.
Maybe the devils work or accidental sorcery is at hand. Maybe it is the another one of those natural mysteries.