Bharat, I'm sorry,but that's another clue I don't like very much if 'unearth' is the answer! The 'recalled' in it doesn't refer to the country nor to the society of universal observers, so there seems to be no reason for it being there. And 'unearth' doesn't really mean to 'dig treasure' (or even 'dig up treasure'). I think 'unearth' could just about work for 'dig up treasure perhaps', showing an example of what unearthing could do, but the rest of the clue doesn't really work for me.