Ocean current depends on many things. The ocean current depends on the temperature of the air, gravity, tides,the density of the water, and carbon dioxide levels. All of those create the current of the ocean. There are also different currents all over the world because those the temperature or density is different in other places.
The different layers and zones of the ocean.
The farther down you go in the ocean, the temperature and pressure changes. The pressure gets much greater and more powerful. Humans can no survive too far down. Also, it gets much colder on the way down.