Well, isn't this an amazing find. A non-typical, original game that isn't a COD-clone. "Depth" is a game where you can choose to be the Predator or Thief. As the Predator, you're a 21-foot man-eating shark and your objective is to find and dismember divers. You get "Shark vision" which lets you experience the sights, sounds and smells of the shark's world. Track prey by the disturbances they make in the water or by the sound of their own heartbeat! As the Shark you have the ability of full-body dismemberment, tear off your victim's limbs one by one and let him bleed to death or take him out with the final bite.
As a "Thief" you obviously play a human diver and your objective is to loot wealth in the form of sunken booty on the ocean floor - the only way to do this is to outsmart the 21-foot Shark enemies that are hunting you. Take cover in dense sea-weed, wrecks or stay as quiet as possible while the Shark's are hunting for you.