Of course the flux of water into any volume is equal to the outward flux. But I would imagine the situation is that there are circulating turbulent branching st

Of course the flux of water into any volume is equal to the outward flux. But I would imagine the situation is that there are circulating turbulent branching streams of current pulling you down. If you were incredibly lucky, and not killed by impacting the walls, you might pop back up by catching a ride on another section of current.