My Imam once told me that due to lack of space the graves in Mecca and Medina are re-usable concrete graves, the interiors are plastered. He said they place the body in there after funeral-prayers with some chemical on it and that chemical dissolves the body so that the grave can be re-used some time later.
At first it freaked me out but now that I think of it the body disintegrates anyway and if they’re using a naturally occuring substance it’s only speeding up that process. With the lack of space in the world it might not be such a bad idea.
Has anyone else heard of this? Is it true? Are there any bones etc. left over, and if so what do they do with them?