The story is about: Atlantis existed and the faction from our legends loved Earthlings. They departed, forgetting about Earth. A new faction sees our inferior species destroying the planet. They claim Earth as theirs, opening portals to flood the oceans to above 7000'. Zack is jet skiing in Florida when the apocalypse happens. He saves a damsel in distress, discovers freaky sea monsters, and creates a raft city. Zack must save the desperate, improve his base, and use the overlords reward system to bide his time.

[From Steam]