There is/was a 25'+/- sailboat submerged perfectly upright with only the mast above water approx 2/3 of the way from the YC to "J" mark, about 300 yds offshore. Not sure if it is still there. I have the LAT/LON in my GPS but don't have my GPS with me.

If that one is there, you have to think there might be others we just haven't found yet.