Is it possible that there is an advanced civilization living beneath the surface of our planet?

Many people believe that the Hollow Earth theory is more than just a myth, and some have even tried to prove it scientifically. Even today, in the 21st century, it’s difficult to say with certainty that it does or does not exist.

For many years it was believed that the earth was hollow, but even though many have come up with theories, until 1968 there was no proof.

That year, pictures taken by a satellite orbiting Earth clearly showed a gaping hole located at the North Pole; enough evidence to support the hollow Earth theory according to many. https://www.youtube.com/watch?v=uwfDdOn336A