Nope .. checked through all the AI players, noone has something like that .. and even than the planets would go *BOOM*, but I wouldn't get the "core instability detected"-message !!!
Besides, any AI would have had troubles getting through the mines inone piece
It's definitly a bug it is !
(!&$%§! .. I accidently deleted the savegame
before I attached it to the message to MM .. started new game, maybe it will show again ...)
A.