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In The Songs of Distant Earth, a short story by Arthur C. Clarke, the ocean planet Thalassa is settled by human colonists around the year 2700.
Set on the ocean planet Russalka, named after the mythical mermaid by its Russian colonists, they follow young civilian submariner Katya Kuriakova as she lives through a time of increasing conflict between the colonists' two main factions and the remnants of a failed Terran invasion.