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Reminds me of something that happened on our dive boat. Two divers returned to the boat sating they had found an anchor and wanted to retrieve it. They had unshackled the chain from the anchor so it could be brought up with a lift bag. The boat's captain replied something to this effect: "That was OUR anchor you idiots!"
I do not pick up bottles, but yes their is plenty. I do pick up steamship china. I found all this just this year.