The Planet of the Sharks is set after global warming melts the polar ice caps & sea levels rise.
With most of the earth now flooded, there are only a few survivors who live on floating 'cities'.
They survive by trading with each other but Sharks are now the dominant life form on the planet & have started to band together to destroy the human survivors.
One such floating city is a research station trying to 'mend the earth'. Will they succeed or will the rampaging sharks get them first?
If you like Shark movies like Sharknado then this is the one for you. Not quite as good as Sharknado but it is worth watching in my humble opinion.