Thanks for the replies and interest . My point for the question is to focus on the most prevailing unknown . Most forum members are analytical and open to the possibility for the concave theory . But the nexus / cause of this planet would seem the most interesting idea to pursue . Clearly the TBP expend lots of money and time to engage this unknown . My approach for understanding it would come from the works of Walter Russell , who was also a contemporary of Tesla . They both conferred and supported each others theories , but concluded that humanity was not advanced enough to utilize them fully . The possibility for a octahedron in the center could be supported with the idea that two vortices are intertwined and joined at their apexes . So these would be opposing and creating forces that manifest this world , but not actual pyramids . Also using his theory we could conclude what is outside the earth is a cube . I believe his most significant contribution is bringing together God and science with a well defined and dynamic understanding . Some of his books are online , such as The Universal One and the Secret of Light . I do believe these ideas will shed more understanding to this novel pursuit . http://pondscienceinstitute.on-rev.com/svpwiki/tiki-index.php?page=Ether+-+Russell . Hope to hear more from you guys !