In the case of planet Earth, during the Second Host which occurred circa 18,500 B.C., the Celestials observed how the Eternals had ignored the race of humans while the Deviants enslaved it. The Celestials destroyed most of the Deviants and their stronghold of Lemuria, causing it to sink below the ocean. This event has been referred to as the Great Fall or the Great Cataclysm which caused the sinking of Atlantis. The Second Host also trapped the Dreaming Celestial.
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