What lies beneath? From personal experience all sorts of bobbing paraphernalia that we somehow manage to lose during a dip. Even if a bobber notices immediately we never seem to be able to recover the missing item. We joke that there is a cave where the seal keeps all the human trinkets that he finds in the sea that is either lost or caught in the rising tide. Yesterday something caught the eye of a bobber in about 80 cms of water. Someones precious Apple Watch. No one else on the beach and no clue to the owner. We took it home and placed a message on a local lost and found site and a swimmers page.
Nothing happened all day but in the evening a man knocked on our door. He had been tracking his watch and had tried many houses before he got to us. Watch and man were reunited, seemingly very happily.