Unlike that one person above with his negative comment on something he has no clue about. I found the fill very interesting; it is something that has not been discovered until recently! I am a ufologist and a researcher on the subject. The odds of finding something like this these days are very rare! The information given in this documentary made me start looking closer at maps and locations in search of more things like this! The isolated location and the way in which it was left to be seen from the skies have to tell that there is an alien connection or a message to them in some way appreciating what they may have seen. I can't find any other reason why it would be there! Take it Some people feel that it has to be a scientist who is able to appreciate this! I, for one, enjoyed it and got a copy for future reference! Great Job!