Dark Life by Kat Falls
Earthquakes shattered the continents, toppling entire regions into the rising water. Now, humans live packed into stack cities. The only ones with any space of their own are those who live on the ocean floor, the Dark Life. Ty has spent his whole life living deep undersea, helping his family farm the ocean floor. But when outlaws attack his homestead, Ty finds himself in a fight to save the only home he has ever known. Joined by Gemma, a girl from the Topside who has come subsea to look for her brother, Ty ventures into the frontier's rough underworld and discovers some dark secrets to Dark Life . . . secrets that threaten to destroy everything.
This was an incredibly fun read. I loved all the little references to sea-life and Ty was a great characters. The world building was really well done (though there were a few things that made me scratch my head--but this is true of most dystopians/future-set books), and I loved thinking about all the little details of what it would be like to live underwater. I also found myself wanting to know more about the world "Topside" which was also intriguing in the little details here and there. The story itself was not that intricate, and was very much like a typical Western, but it worked. Lots of fun!
Okay, I've been waiting to start Mockingjay all week and it's KILLING me!!!