Actually, I've only had half an eye on the forum lately, and have not had a lot of time to google up answers. I'm going through one of those periodic very very busy times at work.
Your clue about the graves reminded me of reading about Goog's track, and all it took was a quick google to confirm. When I put up the previous answer, I briefly considered the track, but the length of it is reported differently in a number of references.
I'll be back with a question.