Never heard of this. You'd think some scientist would have done tests to find out what's going on.

There was some reasearch done in USSR, but it didn't give any conclusion. Just f.e. a statement that body is a body of a male that died 500 years ago from whatever reason and it didn't decompose in 500 years. No special substances found that could be part of mummification process. Just human remnants, that not decomposed in 500 years.

IDK, scientifically speaking, may be creating new cause-effect chains (what make us God-like) i.e. doing right, good things make your body resistant to decay and parasites (both physical and spiritual), as in life, so after.

What about Egyptian mummies though, those seem in not bad shape

Bodies of mummies was specifically processed to make them stable. And that was not a simple process. But in the case of saints, nobody process them. They was buried as a usual people, and later (it could be centuries later) it was revealed that body is intact. And it could be both ways - undecaying body found in crypt and then after studying life of this person he declared saint, or after declaring saint somebody check body and found it undecayed.

some scientists have tried to explain what's going on.. where's that?

Looks like modern science working on how to prevent that phenomena and not on finding what is going on with it.

Of course it is an interesting phenomena, and it should be studied by scientists, because comprehension of God's idea is one of the main purposes of science.

There are also other physical phenomenas known to Orthodox Christianity. F.e. icons or crosses myrrhing or descending of blessed fire, cloak of Blessed Virgin and so on.

Never heard of this. You'd think some scientist would have done tests to find out what's going on.

There was some reasearch done in USSR, but it didn't give any conclusion. Just f.e. a statement that body is a body of a male that died 500 years ago from whatever reason and it didn't decompose in 500 years. No special substances found that could be part of mummification process. Just human remnants, that not decomposed in 500 years.

What about Egyptian mummies though, those seem in not bad shape

Bodies of mummies was specifically processed to make them stable. And that was not a simple process. But in the case of saints, nobody process them. They was buried as a usual people, and later (it could be centuries later) it was revealed that body is intact. And it could be both ways - undecaying body found in crypt and then after studying life of this person he declared saint, or after declaring saint somebody check body and found it undecayed.

some scientists have tried to explain what's going on.. where's that?

Looks like modern science working on how to prevent that phenomena and not on finding what is going on with it.

Of course it is an interesting phenomena, and it should be studied by scientists, because comprehension of God's idea is one of the main purposes of science.

There are also other physical phenomenas known to Orthodox Christianity. F.e. icons or crosses myrrhing or descending of blessed fire, cloak of Blessed Virgin and so on.