Theories about Atlantis mention the extensive use of crystals by Atlanteans. Crystals varied in slight, color, and harmonic frequencies. Crystals follow harmonic frequencies and could be used with an instrument that looks like a tuning fork.
The Inner Earth & Realm of Aghartha...Explained in Detail
LET US FIND OUT WHAT IS GOING ON INSIDE THE HOLLOW PLANET EARTH
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http://www.thenewearth.org/InnerEarth.html