- last post: 01.01.0001 12:00 AM PDT
Very interesting theory, however I think there are several flaws and numerous other more applicable theories. I think ghostvirus's theory of this as being a type of key or revealing device is very powerful.
The theory of the alloys of the earth being of similar composition to those of this installation and therefore leaving it un-detected are a bit fallible. Underground detection is done through numerous methods such as mass density variations (quite noticeable on an overall earth-sized scale) and induced sesmic testing. While the variation created by this structure may go unnoticed in such a remote location the ability for it to be undetected along the diameter of the earth is a bit of a long shot.
The belief that a structure could radiate the circumference of the earth is quite far off when considering plate tectonics. The African Tectonic plate is an overall lighter density then the plate to the south, and to the north along the Arabian plate it is forming a tectonic ridge (mountains). This plate isn't prone to subduction and most likely (especially the dry-land portion) has existed in one form or another since the formation of the Earth. Unlike oceanic plates which through subduction will descend through the athenosphere and into the Earth's mantle as it is heated into a molten state around 1500km below the surface. Knowing this knowledge it can be understood that an underground installation could exist long before humans inhabited earth, and it could have remained in this position unharmed for millions and millions of years.
However a ring just under the earth's surface would be almost impossible to build. While it is understood that traditional construction techniques are not being used the ridges and movements between plates (several inches in relative movement per year) would disrupt and destroy anything constructed in the Earth's lithosphere (especially oceanic lithosphere).
Another fatal flaw to the ring theory is the fact that this hole is theorized to be only a couple miles deep. The variations along the earth's surface in diamater vary greatly especially along portions such as mid-ocean ridges. A halo ring would be constructed with a perfect diamater, and likely would fail this possiblity as well.