If you were to fill up a tub with water at the very highest that the water could go, and then sit inside the tub, do you think the water would sink due to your density upon the water, or would you submerge into the water (the water arises above you?)
the water would form around you, because the human body is solid, and would take up some of the volume of the tub. the water then goes up due to the added volume.
