Drantinia

Drantinia, a planet covered mostly in water and the home of the relatively advanced Drantins. Its atmosphere is toxic for all but the Drantins and a few of its other inhabitants including the dreaded leviathan beasts. It is located at the far edge of the universe, in orbit in the Ci'ack (Cyack) system. The red moon of Vantoa (Named after the Drantinitan god of the moon) is in a close orbit causing extreme tides and a hazard for orbiting satellites and space stations on the already large planet of 1.2 to earth scale. Drantinias oceans have enough weight to crush submarines that travel to deep and the oceans floor is nearly flat. Its Iron and Algen mountains are the only structures other than the drantinian subs that can stand the pressure

History
Drantinia was not always a giant ocean. For a time its terrestrial life flourished with its lush forests and snow peaked mountains although the mountain did have a great amount of water at this time. Then on 2340 AD Undated a shower of comets rained down on Drantinia whipping out most life and wreaking havoc on the Planet. The ice impacting the planet caused flooding and not many survived what seemed to be the Apocalypses for this planet.