There's a wee bit of Google Earth trickery at this
http://www.livephysics.com/ptools/dig-hole-through-earth.php which allows you to select somewhere to start digging through the earth and it tells you where you'll pop out.
From hereabouts, I'll end up somewhere in the sea south of New Zealand:
🔗Personal-Album-2-Image-116[linkphoto]Personal-Album-2-Image-116[/linkphoto][/link]
Now then - does that little pic remind anyone of Thorpey's pics of the Hunter Tunneler bores? Mind, it might explain where the machines ended up... 😮
Hello again darkness, my old friend...