THE TRUTH OF THE INNER EARTH HAS BEEN REVEALED In 1960, UFO writer Michael Barton, known to his readers as Michael X, published a small book titled RAINBOW CITY AND THE INNER EARTH PEOPLE, a curious mashup of various hollow-earth theories, the Hefferlin Manuscript, and the Shaver Mystery. Michael X tells us that the Inner Earth is far from a enlightened homogenous group. Some of the inhabitants are Masters, some are deros, and some are ordinary humans.