What lies down below?

On the ocean floor that is! Because despite all of our technological advances, there are huge unexplored regions in the briny deep. Who can truly say what lives in those remote areas with absolute certainty? Giant squids, megalodons, and, coelacanths have only recently been discovered in some of the lesser explored depths. But who can say what else might lurk down below? Abominable ocean yetis? Some kind of gateway to Atlantis? Alien theme parks? A ferocious laser octopus? Who knows...

http://robotlizzzrd.deviantart.com/art/Ocean-floor-689315837?ga_submit_new=10%3A1498701423