I dove in rough surf and poor visibility, about twenty to twenty-five feet. Using my flashlight to help see, I shined it into cave and saw the corner of a piece of Jade sticking out of sand. When I went in and pulled on it, it wouldn't budge. I eventually ran out of air and so had to surface. I went back and worked on getting the rock loose. I finally got it out of the sand and it was too heavy to bring up. I surfaced, removed my weight belt and went back. The third time I was able to bring the rock up. It measures approximately 18 inches long by almost a foot wide, about six inches thick average, and it weighs 32 lbs.