The other day I pulled about a 10 foot long piece of rusted metal out of the sand in knee deep water at low tide. About four feet of it was sticking up out of the sand, with about two feet of it sticking up out of the water. Took me a minute, but I pulled it up and out of the sand and dragged it up the beach to the dune line. Encrusted with barnacles... someone had tied a long piece of caution tape to it. It would have literally impaled you if you where to happen to fall on it.