I can believe it. I was once sat eating food on a beach in Thailand with my Thai wife, there was a foreigner stood waste deep in the sea just walking up and down, curiosity got the better of me, I went to see what he was doing, he was clearing plastic bags, there were absolutely loads of them, I could not believe it, they were buried in the sand, he explained he came down everyday, I helped for about 30 minutes and went back to my wife