At last, the Discovery Channel documentary about the hollow earth has yet again resurfaced. It speaks of the concerted effort on part of governments around the world to conceal the regions beyond the poles and to hide our true origins within the safety and confines of the earth's crust. It credibly documents the United States federal law which mandates federal permits and/or a federal chaperone whenever exploring any underground region. The idea of a hollow earth has been on the table for far longer than most "fringe" theories and calls for weighty consideration by any reasonably scientific mind.
Discover Hollow Earth Video (4:29 ~ short excerpt)