Particularly how can a human leap from the water like a dolphin. I'm guessing buoyancy and velocity are the main factors involved here, like a water polo ball pushed under will spring out no problem. Or a whale given enough velocity. A dolphin can dive deeper and quicker than humans and therefore swim up faster, but there has to be a point at which a human can do it, with the aid of flippers and buoyancy aids perhaps? But it's the physics, the formula that would give me the specifics that I'm after. Someone must have thought of this before, anyone?