posted on Jan, 6 2010 @ 09:51 AM
Originally posted by andy1033
Could the lasers penetrate the rocks, and meet under the sea? Is that what your saying they did?
I was a Rodman on a survey crew for about 7 years;
You start at a known point, and you set and shoot what is known as a traverse point. its usually just a nail in the ground that you use to make your
calculations. Bores dig a little, then they set more traverse points on the recently dug sections, and shoot the laser BACK OUT OF THE HOLE, to other
known points like foundation landmarks or even property corners in most normal non chunnel cases. They work out the angles through trigonometry, and
sometimes even a compass. then they keep building along the planned route as long as all the numbers are exactly what they should be, if not, they
will move the bore closer to the path it needs to take. they check and re check the route to make sure that it is EXACTLY where they want it to be by
shooting lasers to a Guy holding a prism mirror (very fancy mirror) on a pole of known fixed height who checks each of the traverse points, and there
are guys on the other side doing the exact same thing until it is complete.
it is the exact same way they made the cotenetial railraod in the united states even though its above ground
[edit on 6-1-2010 by drsmooth23]