posted on Oct, 21 2012 @ 09:45 AM
I think that the last image is an artifact; a very cool one, but an artifact of nature. It's so close to the shore that the constant wave action
would, I think, erase anything carved over the course of a 100 years or so.
As to the USB symbol, that is play on the light and the angle. I copied your coordinates into Google Earth and set the angle to approximated 45 and
looked at the symbol:
I traced the line in Yellow via Gimp and as you can see the lines are not continuous and there are other lines that make up part of the complex.
A for effort though!
Everything depends on perspective and context.