So I saw the post with the Bernoulli math, but playing with my grandsons in the leisure pool we have observed a ping pong ball released from about 12 inches below clear the surface of the water by an unmeasured inch and a half. And when the twelve year old swims to the bottom of the four foot deep section and releases the ball it appears to clear by the same inch and a half. We were wondering why we didn't see a change. Of course three feet in depth may not be enough to make a difference in casual observation, but the lifeguards don't like us playing with ping pong balls in the deeper pool. Second thing we have noticed is that no matter how carefully we release it the ball seems to spin just below the surface of the water and only creates a splash on one side and always the same side. Help a Grandma out here, these boys are budding scientists.