How is this movie even a thing?

Rating: 3/10 (2 February 2019)

Back story, who needs it. I'm saving a hijacked submarine because just because. Sure, a lot of time wasted on his being a half-breed. Zero time on what makes him tick, other than his mommy issues. And I have superman like powers why exactly?
Acting, they must have busted the whole budget on Momoa. Most of the cast is from the Hayden Christian school for being Anakin Skywalker .
Plot. We're going to invade the surface world, but first will teach them about pollution and put beach their aircraft carriers. And that hijacked submarine, it shows up in the most obvious setup and attacks for no reason, and no one is even suspicious (and there never is a reveal, just ignore it ever happened). Also, let's not destroy the surface dwellers that easily, first we must have the most massive war amongst ourselves to insure that we destroy our own armies. Oh, and why are they traveling in boats when they can swim and breathe underwater.
Don't miss the obvious Karate Kid rip-off sequences done without any humor or self-awareness, right down to the hard to master winning kick (in this case, mystical water spinning trident thingy).
CGI. Step above the dancing baby of years past.
Action? Wow, they just barely got away -- again, and again, and again, and again, and again.
Villains. Not really, just another guy with mommy issues and a misunderstand pirate with daddy issues.