The core of the hollow Earth theory is that our planet is a shell with walls about 1,500 kilometres thick and openings at the polar regions with edges that curve smoothly from the outside of the shell to the inside.

Entering this inner world is like a fly crawling over the lip of a coffee mug from the outside to the inside, with travellers by air or sea fooled into believing they are crossing the pole by their compasses, when actually they are simply encountering the “magnetic rim” that leads to the inner Earth.

While there is no real proof of this being the case, the conventional understanding of the Earth’s make-up is also based largely on assumption rather than fact, with no method existing to directly sample the deep interior of the planet...FULL STORY