We are not professional sailors hence why we find an experienced captain and crew. We are at Cooper anchored at Haulover Bay. Saw a boat adjacent to the National Parks mooring ball with anchor down in coral. Captain let them know this is a no no. So, they tried to pull up anchor and hauled up a large piece of coral after 20 minutes of back and forth and some crunchy sounds. They then made several attempts at the mooring ball and finally made it. Now trying to figure out how to remove the large piece of coral off the anchor and sure they are our neighbors for tonight. Hope they don't try anything else stupid or injur more coral, themselves or others!!