18,000 BCE

18,000 BCE is a year that refers to events that took place 18,000 years before the common era, or for some scholars, 18,000 years before the birth of Jesus Christ. In Marvel Comics continuity, the event known as the Great Cataclysm took place around this time. During this era, most of the land masses on Earth connected as a super-continent. This included the lands of Altantis, Lemuria, Mu, Thuria, and Pangea. While Atlantis was ruled by humans, Lemuria and Mu were dominated by the monstrous Deviants - failed genetic experiments cultivated by a race of space gods known as the Celestials. Conflict between the various growing empires was inevitable, and it was only a matter of time before the Deviants of Lemuria waged full-scale war against Atlantis. Although the Atlantean city-state was protected by a great dome, it would not take much for the full company of Lemurian siege weapons to shatter their protective shield. Atlantean king Kamuu, in a last ditch effort to stem the tide of warriors, opened up the city's magma pits to drive them back. While this tactic proved successful, it also had adverse side-effects on the land's continental crust, and the seismic upheavel resulted in Atlantis beginning to sink beneath the waves.

Coinciding with this incident was the arrival of the Second Host of Celestials. The Deviants rebelled against their creators, opening fire upon the great Celestial ship. The Celestial known as Arishem the Judge deemed the denizens of Earth to be unworthy of life, and so he unleashed a cosmic super-weapon that caused a worldwide conflagration. This resulted in a Great Flood that split apart the various continents, causing them to drift, and ultimately sink beneath the waves.

Characters who existed in

 * Kamuu
 * Zartra

Appearances of

 * Sub-Mariner 62
 * Sub-Mariner 63